diff --git a/package.json b/package.json
index 1de5c7d..e6bcbaa 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
+    "@radix-ui/react-separator": "^1.1.8",
     "@radix-ui/react-slot": "^1.2.3",
     "@tailwindcss/vite": "^4.1.16",
     "class-variance-authority": "^0.7.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 4aa6584..0b2c207 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -17,6 +17,9 @@ importers:
       '@radix-ui/react-dropdown-menu':
         specifier: ^2.1.16
         version: 2.1.16(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
+      '@radix-ui/react-separator':
+        specifier: ^1.1.8
+        version: 1.1.8(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
       '@radix-ui/react-slot':
         specifier: ^1.2.3
         version: 1.2.3(@types/react@19.2.2)(react@19.2.0)
@@ -642,6 +645,19 @@ packages:
       '@types/react-dom':
         optional: true
 
+  '@radix-ui/react-primitive@2.1.4':
+    resolution: {integrity: sha512-9hQc4+GNVtJAIEPEqlYqW5RiYdrr8ea5XQ0ZOnD6fgru+83kqT15mq2OCcbe8KnjRZl5vF3ks69AKz3kh1jrhg==}
+    peerDependencies:
+      '@types/react': '*'
+      '@types/react-dom': '*'
+      react: ^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc
+      react-dom: ^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc
+    peerDependenciesMeta:
+      '@types/react':
+        optional: true
+      '@types/react-dom':
+        optional: true
+
   '@radix-ui/react-roving-focus@1.1.11':
     resolution: {integrity: sha512-7A6S9jSgm/S+7MdtNDSb+IU859vQqJ/QAtcYQcfFC6W8RS4IxIZDldLR0xqCFZ6DCyrQLjLPsxtTNch5jVA4lA==}
     peerDependencies:
@@ -655,6 +671,19 @@ packages:
       '@types/react-dom':
         optional: true
 
+  '@radix-ui/react-separator@1.1.8':
+    resolution: {integrity: sha512-sDvqVY4itsKwwSMEe0jtKgfTh+72Sy3gPmQpjqcQneqQ4PFmr/1I0YA+2/puilhggCe2gJcx5EBAYFkWkdpa5g==}
+    peerDependencies:
+      '@types/react': '*'
+      '@types/react-dom': '*'
+      react: ^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc
+      react-dom: ^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc
+    peerDependenciesMeta:
+      '@types/react':
+        optional: true
+      '@types/react-dom':
+        optional: true
+
   '@radix-ui/react-slot@1.2.3':
     resolution: {integrity: sha512-aeNmHnBxbi2St0au6VBVC7JXFlhLlOnvIIlePNniyUNAClzmtAUEY8/pBiK3iHjufOlwA+c20/8jngo7xcrg8A==}
     peerDependencies:
@@ -664,6 +693,15 @@ packages:
       '@types/react':
         optional: true
 
+  '@radix-ui/react-slot@1.2.4':
+    resolution: {integrity: sha512-Jl+bCv8HxKnlTLVrcDE8zTMJ09R9/ukw4qBs/oZClOfoQk/cOTbDn+NceXfV7j09YPVQUryJPHurafcSg6EVKA==}
+    peerDependencies:
+      '@types/react': '*'
+      react: ^16.8 || ^17.0 || ^18.0 || ^19.0 || ^19.0.0-rc
+    peerDependenciesMeta:
+      '@types/react':
+        optional: true
+
   '@radix-ui/react-use-callback-ref@1.1.1':
     resolution: {integrity: sha512-FkBMwD+qbGQeMu1cOHnuGB6x4yzPjho8ap5WtbEJ26umhgqVXbhekKUQO+hZEL1vU92a3wHwdp0HAcqAUF5iDg==}
     peerDependencies:
@@ -2303,6 +2341,15 @@ snapshots:
       '@types/react': 19.2.2
       '@types/react-dom': 19.2.2(@types/react@19.2.2)
 
+  '@radix-ui/react-primitive@2.1.4(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)':
+    dependencies:
+      '@radix-ui/react-slot': 1.2.4(@types/react@19.2.2)(react@19.2.0)
+      react: 19.2.0
+      react-dom: 19.2.0(react@19.2.0)
+    optionalDependencies:
+      '@types/react': 19.2.2
+      '@types/react-dom': 19.2.2(@types/react@19.2.2)
+
   '@radix-ui/react-roving-focus@1.1.11(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)':
     dependencies:
       '@radix-ui/primitive': 1.1.3
@@ -2320,6 +2367,15 @@ snapshots:
       '@types/react': 19.2.2
       '@types/react-dom': 19.2.2(@types/react@19.2.2)
 
+  '@radix-ui/react-separator@1.1.8(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)':
+    dependencies:
+      '@radix-ui/react-primitive': 2.1.4(@types/react-dom@19.2.2(@types/react@19.2.2))(@types/react@19.2.2)(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
+      react: 19.2.0
+      react-dom: 19.2.0(react@19.2.0)
+    optionalDependencies:
+      '@types/react': 19.2.2
+      '@types/react-dom': 19.2.2(@types/react@19.2.2)
+
   '@radix-ui/react-slot@1.2.3(@types/react@19.2.2)(react@19.2.0)':
     dependencies:
       '@radix-ui/react-compose-refs': 1.1.2(@types/react@19.2.2)(react@19.2.0)
@@ -2327,6 +2383,13 @@ snapshots:
     optionalDependencies:
       '@types/react': 19.2.2
 
+  '@radix-ui/react-slot@1.2.4(@types/react@19.2.2)(react@19.2.0)':
+    dependencies:
+      '@radix-ui/react-compose-refs': 1.1.2(@types/react@19.2.2)(react@19.2.0)
+      react: 19.2.0
+    optionalDependencies:
+      '@types/react': 19.2.2
+
   '@radix-ui/react-use-callback-ref@1.1.1(@types/react@19.2.2)(react@19.2.0)':
     dependencies:
       react: 19.2.0
diff --git a/src/components/biz/ai-translate-modal.tsx b/src/components/biz/ai-translate-modal.tsx
index b18a502..fd706ec 100644
--- a/src/components/biz/ai-translate-modal.tsx
+++ b/src/components/biz/ai-translate-modal.tsx
@@ -1,6 +1,14 @@
 import { memo, useEffect, useState } from "react";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
+import { Checkbox } from "@/components/ui/checkbox";
+import {
+  DropdownMenu,
+  DropdownMenuTrigger,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+} from "@/components/ui/dropdown-menu";
 import {
   Dialog,
   DialogContent,
@@ -9,6 +17,7 @@ import {
   DialogTitle,
 } from "@/components/ui/dialog";
 import { requestTranslations } from "@/lib/ai";
+import { ButtonGroup } from "../ui/button-group";
 
 type Props = {
   open: boolean;
@@ -16,13 +25,21 @@ type Props = {
   languages: string[];
   paths: string[];
   prompt: string | undefined;
-  onConfirm: (result: Record<string, Record<string, string>>) => Promise<void> | void;
+  initialSelectedLanguages?: string[];
+  getExistingByPath?: (path: string) => Record<string, string>;
+  onConfirm: (
+    result: Record<string, Record<string, string>>,
+    options: { overwrite: boolean; selectedLanguages: string[] }
+  ) => Promise<void> | void;
 };
 
-function AiTranslateModalImpl({ open, onOpenChange, languages, paths, prompt, onConfirm }: Props) {
+function AiTranslateModalImpl({ open, onOpenChange, languages, paths, prompt, initialSelectedLanguages, getExistingByPath, onConfirm }: Props) {
   const [inputsByKey, setInputsByKey] = useState<Record<string, string>>({});
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const [selectedLangs, setSelectedLangs] = useState<string[]>([]);
+  const [overwrite, setOverwrite] = useState(false);
+  const [existingCache, setExistingCache] = useState<Record<string, { lang: string; text: string }[]>>({});
   const MAX_ITEMS = 50;
   const overLimit = paths.length > MAX_ITEMS;
 
@@ -31,10 +48,28 @@ function AiTranslateModalImpl({ open, onOpenChange, languages, paths, prompt, on
       const init: Record<string, string> = {};
       for (const p of paths) init[p] = inputsByKey[p] ?? "";
       setInputsByKey(init);
+
+      // 初始化默认勾选语言
+      const initSelected = (initialSelectedLanguages && initialSelectedLanguages.length > 0)
+        ? initialSelectedLanguages
+        : languages;
+
+      setSelectedLangs(initSelected);
+      setOverwrite(false);
+      setExistingCache({});
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [open, paths.join("|")]);
 
+  function loadExistingForPath(path: string) {
+    if (existingCache[path]) return;
+    const map = getExistingByPath?.(path) ?? {};
+    const arr = Object.entries(map)
+      .map(([lang, text]) => ({ lang, text }))
+      .filter((it) => typeof it.text === "string" && it.text.trim() !== "");
+    setExistingCache((old) => ({ ...old, [path]: arr }));
+  }
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault();
     if (overLimit) {
@@ -50,11 +85,15 @@ function AiTranslateModalImpl({ open, onOpenChange, languages, paths, prompt, on
       setError("当前项目暂无目标语言");
       return;
     }
+    if (selectedLangs.length === 0) {
+      setError("请选择目标语言");
+      return;
+    }
     setLoading(true);
     setError(null);
     try {
-      const result = await requestTranslations({ items, languages, prompt });
-      await onConfirm(result);
+      const result = await requestTranslations({ items, languages: selectedLangs, prompt });
+      await onConfirm(result, { overwrite, selectedLanguages: selectedLangs });
       setInputsByKey({});
       onOpenChange(false);
     } catch (e) {
@@ -78,27 +117,114 @@ function AiTranslateModalImpl({ open, onOpenChange, languages, paths, prompt, on
         <DialogHeader>
           <DialogTitle>{`AI 翻译 — 已选 ${paths.length} 条`}</DialogTitle>
         </DialogHeader>
-        <form onSubmit={handleSubmit} className="space-y-3">
+        <form onSubmit={handleSubmit} className="space-y-4">
           <div className="space-y-4 max-h-[50vh] overflow-auto pr-1">
             {paths.map((p) => (
               <div key={p} className="flex flex-col gap-2">
-                <div className="truncate font-mono text-xs text-muted-foreground">{p}</div>
-                <Input
-                  className="grow"
-                  value={inputsByKey[p] ?? ""}
-                  onChange={(e) => setInputsByKey((old) => ({ ...old, [p]: e.target.value }))}
-                  placeholder="请输入原文本"
-                  aria-label={`原文 ${p}`}
-                />
+                <div className="truncate font-mono text-xs text-muted-foreground">
+                  {p}
+                </div>
+                <ButtonGroup className="w-full">
+                  <Input
+                    className="grow"
+                    value={inputsByKey[p] ?? ""}
+                    onChange={(e) =>
+                      setInputsByKey((old) => ({ ...old, [p]: e.target.value }))
+                    }
+                    placeholder="请输入原文本"
+                    aria-label={`原文 ${p}`}
+                  />
+                  <DropdownMenu
+                    onOpenChange={(open) => {
+                      if (open) loadExistingForPath(p);
+                    }}
+                  >
+                    <DropdownMenuTrigger asChild>
+                      <Button
+                        type="button"
+                        variant="outline"
+                        aria-label="使用已有翻译"
+                      >
+                        使用已有翻译
+                      </Button>
+                    </DropdownMenuTrigger>
+                    <DropdownMenuContent
+                      align="end"
+                      className="max-w-96 whitespace-normal wrap-break-word"
+                    >
+                      {(existingCache[p]?.length ?? 0) === 0 ? (
+                        <DropdownMenuItem disabled>无可用内容</DropdownMenuItem>
+                      ) : (
+                        (existingCache[p] || []).map((opt) => (
+                          <>
+                            <DropdownMenuLabel>
+                              {opt.lang}
+                            </DropdownMenuLabel>
+                            <DropdownMenuItem
+                              key={`${p}:${opt.lang}`}
+                              onClick={() =>
+                                setInputsByKey((old) => ({
+                                  ...old,
+                                  [p]: opt.text,
+                                }))
+                              }
+                              title={opt.text}
+                            >
+                              <span className="truncate block">{opt.text}</span>
+                            </DropdownMenuItem>
+                          </>
+                        ))
+                      )}
+                    </DropdownMenuContent>
+                  </DropdownMenu>
+                </ButtonGroup>
               </div>
             ))}
           </div>
-          <div className="text-xs text-muted-foreground">
-            目标语言：{languages.join(", ") || "无"}
+          <div className="space-y-2">
+            <div className="text-xs text-muted-foreground">
+              请选择目标语言：
+            </div>
+            <div className="flex flex-wrap gap-3">
+              {languages.map((lang) => {
+                const checked = selectedLangs.includes(lang);
+
+                return (
+                  <label
+                    key={lang}
+                    className="inline-flex items-center gap-2 select-none"
+                  >
+                    <Checkbox
+                      checked={checked}
+                      onCheckedChange={(v) => {
+                        setSelectedLangs((old) => {
+                          const set = new Set(old);
+                          if (v) set.add(lang);
+                          else set.delete(lang);
+                          return Array.from(set);
+                        });
+                      }}
+                    />
+                    <span className="text-sm">{lang}</span>
+                  </label>
+                );
+              })}
+            </div>
           </div>
+          <label className="inline-flex items-center gap-2 select-none">
+            <Checkbox
+              checked={overwrite}
+              onCheckedChange={(v) => setOverwrite(!!v)}
+            />
+            <span className="text-sm">覆盖已有翻译（默认仅填充缺失项）</span>
+          </label>
+
           {(error || overLimit) && (
-            <div className="text-sm text-red-600" role="alert">{error}</div>
+            <div className="text-sm text-red-600" role="alert">
+              {error}
+            </div>
           )}
+
           <DialogFooter>
             <Button
               type="button"
diff --git a/src/components/ui/button-group.tsx b/src/components/ui/button-group.tsx
new file mode 100644
index 0000000..30139ec
--- /dev/null
+++ b/src/components/ui/button-group.tsx
@@ -0,0 +1,83 @@
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+import { Separator } from "@/components/ui/separator";
+
+const buttonGroupVariants = cva(
+  "flex w-fit items-stretch [&>*]:focus-visible:z-10 [&>*]:focus-visible:relative [&>[data-slot=select-trigger]:not([class*='w-'])]:w-fit [&>input]:flex-1 has-[select[aria-hidden=true]:last-child]:[&>[data-slot=select-trigger]:last-of-type]:rounded-r-md has-[>[data-slot=button-group]]:gap-2",
+  {
+    variants: {
+      orientation: {
+        horizontal:
+          "[&>*:not(:first-child)]:rounded-l-none [&>*:not(:first-child)]:border-l-0 [&>*:not(:last-child)]:rounded-r-none",
+        vertical:
+          "flex-col [&>*:not(:first-child)]:rounded-t-none [&>*:not(:first-child)]:border-t-0 [&>*:not(:last-child)]:rounded-b-none",
+      },
+    },
+    defaultVariants: {
+      orientation: "horizontal",
+    },
+  }
+);
+
+function ButtonGroup({
+  className,
+  orientation,
+  ...props
+}: React.ComponentProps<"div"> & VariantProps<typeof buttonGroupVariants>) {
+  return (
+    <div
+      role="group"
+      data-slot="button-group"
+      data-orientation={orientation}
+      className={cn(buttonGroupVariants({ orientation }), className)}
+      {...props}
+    />
+  );
+}
+
+function ButtonGroupText({
+  className,
+  asChild = false,
+  ...props
+}: React.ComponentProps<"div"> & {
+  asChild?: boolean;
+}) {
+  const Comp = asChild ? Slot : "div";
+
+  return (
+    <Comp
+      className={cn(
+        "bg-muted flex items-center gap-2 rounded-md border px-4 text-sm font-medium shadow-xs [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4",
+        className
+      )}
+      {...props}
+    />
+  );
+}
+
+function ButtonGroupSeparator({
+  className,
+  orientation = "vertical",
+  ...props
+}: React.ComponentProps<typeof Separator>) {
+  return (
+    <Separator
+      data-slot="button-group-separator"
+      orientation={orientation}
+      className={cn(
+        "bg-input relative !m-0 self-stretch data-[orientation=vertical]:h-auto",
+        className
+      )}
+      {...props}
+    />
+  );
+}
+
+export {
+  ButtonGroup,
+  ButtonGroupSeparator,
+  ButtonGroupText,
+  buttonGroupVariants,
+};
diff --git a/src/components/ui/dropdown-menu.tsx b/src/components/ui/dropdown-menu.tsx
index eaed9ba..4046363 100644
--- a/src/components/ui/dropdown-menu.tsx
+++ b/src/components/ui/dropdown-menu.tsx
@@ -153,7 +153,7 @@ function DropdownMenuLabel({
       data-slot="dropdown-menu-label"
       data-inset={inset}
       className={cn(
-        "px-2 py-1.5 text-sm font-medium data-[inset]:pl-8",
+        "px-2 py-1.5 text-sm font-medium data-[inset]:pl-8 opacity-50",
         className
       )}
       {...props}
diff --git a/src/components/ui/separator.tsx b/src/components/ui/separator.tsx
new file mode 100644
index 0000000..bb3ad74
--- /dev/null
+++ b/src/components/ui/separator.tsx
@@ -0,0 +1,26 @@
+import * as React from "react"
+import * as SeparatorPrimitive from "@radix-ui/react-separator"
+
+import { cn } from "@/lib/utils"
+
+function Separator({
+  className,
+  orientation = "horizontal",
+  decorative = true,
+  ...props
+}: React.ComponentProps<typeof SeparatorPrimitive.Root>) {
+  return (
+    <SeparatorPrimitive.Root
+      data-slot="separator"
+      decorative={decorative}
+      orientation={orientation}
+      className={cn(
+        "bg-border shrink-0 data-[orientation=horizontal]:h-px data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-px",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Separator }
diff --git a/src/pages/editor.tsx b/src/pages/editor.tsx
index 2ef0d04..3c55288 100644
--- a/src/pages/editor.tsx
+++ b/src/pages/editor.tsx
@@ -139,7 +139,44 @@ export default function Editor() {
     onError: (m) => setPageError(m),
   });
 
-  const tableWidth = useMemo(() => (languages.length * 200) + 36 + 60 + 200, [languages.length]);
+  const tableWidth = useMemo(() => (languages.length * 200) + 36 + 60 + 300, [languages.length]);
+
+  function computeSuggestedLanguages(pathsInput: string[]): string[] {
+    if (languages.length === 0 || pathsInput.length === 0) return [];
+
+    const missing = new Set<string>();
+
+    for (const lang of languages) {
+      const langMap = valuesByLang[lang] || {};
+      let hasMissing = false;
+
+      for (const p of pathsInput) {
+        const val = langMap[p];
+        if (typeof val !== "string" || val.trim() === "") {
+          hasMissing = true;
+          break;
+        }
+      }
+
+      if (hasMissing) missing.add(lang);
+    }
+
+    const arr = Array.from(missing);
+
+    return arr.length > 0 ? arr : languages; // 如无缺失则默认全选
+  }
+
+  const getExistingByPath = useCallback((path: string) => {
+    const result: Record<string, string> = {};
+    for (const lang of languages) {
+      const text = valuesByLang[lang]?.[path];
+      if (typeof text === "string" && text.trim() !== "") {
+        result[lang] = text;
+      }
+    }
+
+    return result;
+  }, [languages, valuesByLang]);
 
   const virtuosoComponents = useMemo(() => ({
     Table: ({ style, ...props }: React.TableHTMLAttributes<HTMLTableElement>) => <table className="min-w-full text-sm table-fixed" {...props} style={{ ...style, width: tableWidth }} />,
@@ -166,7 +203,7 @@ export default function Editor() {
           }}
         />
       </th>
-      <th style={{ width: 200 }} className="text-left px-3 py-2">翻译条目名称</th>
+      <th style={{ width: 300 }} className="text-left px-3 py-2">翻译条目名称</th>
       {languages.map((lang) => (
         <th key={lang} style={{ width: 200 }} className="text-left px-3 py-2">{lang}</th>
       ))}
@@ -194,7 +231,7 @@ export default function Editor() {
             }}
           />
         </td>
-        <td className="px-3 py-2 font-mono">
+        <td className="px-3 py-2 font-mono wrap-break-word">
           <button type="button" className="w-full text-left min-h-8 leading-8 px-2 rounded hover:bg-accent" onClick={handleCopy} title="点击复制">
             {entry.path}
           </button>
@@ -287,7 +324,7 @@ export default function Editor() {
         </td>
       </>
     );
-  }, [languages, inline, projectId, structure, setStructure, setValuesByLang, copy]);
+  }, [languages, inline, projectId, structure, setStructure, setValuesByLang, copy, selected]);
 
   useEffect(() => {
     if (!projectId || languages.length === 0) return;
@@ -477,17 +514,25 @@ export default function Editor() {
         onOpenChange={(v) => setAiModal((cur) => (cur ? { ...cur, open: v } : cur))}
         languages={languages}
         paths={aiModal?.path ? [aiModal.path] : []}
+        initialSelectedLanguages={aiModal?.path ? computeSuggestedLanguages([aiModal.path]) : []}
+        getExistingByPath={getExistingByPath}
         prompt={project?.preferences?.aiPrompt}
-        onConfirm={async (translations) => {
+        onConfirm={async (translations, options) => {
           if (!projectId || !aiModal) return;
           const updates: Record<string, Record<string, string>> = {};
           try {
+            const targetLangs = options?.selectedLanguages ?? languages;
             await Promise.all(
-              languages.map(async (lang) => {
+              targetLangs.map(async (lang) => {
                 const prev = valuesByLang[lang] ?? {};
                 const next = { ...prev } as Record<string, string>;
                 const langMap = translations[lang] || {};
-                for (const [k, v] of Object.entries(langMap)) next[k] = v;
+                for (const [k, v] of Object.entries(langMap)) {
+                  const existing = prev[k];
+                  const isFilled = typeof existing === "string" && existing.trim() !== "";
+                  if (!options?.overwrite && isFilled) continue; // 仅填充缺失
+                  next[k] = v as string;
+                }
                 updates[lang] = next;
                 await upsertLanguageTranslations(projectId, lang, next);
               })
@@ -506,17 +551,25 @@ export default function Editor() {
         onOpenChange={setAiBulkOpen}
         languages={languages}
         paths={Array.from(selected)}
+        initialSelectedLanguages={computeSuggestedLanguages(Array.from(selected))}
+        getExistingByPath={getExistingByPath}
         prompt={project?.preferences?.aiPrompt}
-        onConfirm={async (translations) => {
+        onConfirm={async (translations, options) => {
           if (!projectId || selected.size === 0) return;
           try {
             const updatesByLang: Record<string, Record<string, string>> = {};
+            const targetLangs = options?.selectedLanguages ?? languages;
             await Promise.all(
-              languages.map(async (lang) => {
+              targetLangs.map(async (lang) => {
                 const prev = valuesByLang[lang] ?? {};
                 const next = { ...prev } as Record<string, string>;
                 const langMap = translations[lang] || {};
-                for (const [k, v] of Object.entries(langMap)) next[k] = v;
+                for (const [k, v] of Object.entries(langMap)) {
+                  const existing = prev[k];
+                  const isFilled = typeof existing === "string" && existing.trim() !== "";
+                  if (!options?.overwrite && isFilled) continue; // 仅填充缺失
+                  next[k] = v as string;
+                }
                 updatesByLang[lang] = next;
                 await upsertLanguageTranslations(projectId, lang, next);
               })