已上线 · 可在线使用 Live · use it online
「AI 背单词」是一款已上线的间隔重复（SRS）词汇学习应用：每天只学少量新词，到期的复习词优先出现；没学会的词不占当日名额，一组学完自动续下一组。每个单词都有 AI 讲解卡、AI 测验和随时追问的「问 AI」陪学。现在就可以在浏览器里使用（www.vocabfan.online，注册即用、多端同步）——这个页面继续记录它的定位与开发进展。 AI 背单词 is a spaced-repetition vocabulary app, now live: a few new words a day, with due reviews always coming first. Words you haven't truly learned never consume your daily quota, and finished groups flow into the next until the day is done. Every word comes with an AI explainer card, AI quizzes and an always-on Ask AI. You can use it right now in your browser at www.vocabfan.online (sign up to start, syncs across devices) — this page keeps tracking what it is and how the build is going.
在线地址：www.vocabfan.online · 注册即用，支持多端同步 Online at www.vocabfan.online · sign up to start, syncs across devices
核心特性Features
全部特性围绕一件事：让每一次复习都出现在快要忘记的时候。 Every feature serves one goal: each review lands right before you'd forget.
每个单词都有一张 AI 讲解卡：词根拆解 + 谐音记忆 + 两条情景例句。比如 obligation = ob（向）+ lig（捆绑）+ ation →「把人捆绑住的东西」→ 责任。 Every word comes with an AI explainer card: morphological breakdown, a homophone mnemonic and two contextual sentences. Take obligation = ob (toward) + lig (bind) → “the thing that binds you” → a duty.
秒级生成混合题型的测验（实测 8 题约 5 秒出完）。干扰项不是随机凑数，而是 assemble、dissolve 这类真实易混词，答案分布均匀。 Mixed-format quizzes generated in seconds — in testing, 8 questions in about 5. Distractors aren't random filler but genuinely confusable words like assemble or dissolve, with evenly spread answers.
学习中随时追问，秒级回答。比如问 obligation 和 responsibility 有什么区别，回答分点、有条理，当场消化疑惑。 Ask follow-ups any time during a session and get an answer in seconds. Ask how obligation differs from responsibility, for example, and get a structured, point-by-point reply.
每天把当日学过的词编成一篇小故事，读完等于再复习一遍（生成走 Gemini，与测验同一条已验证链路；当日缓存优先，打开即读）。 Each day's words are woven into a short story — reading it is one more review. Generated by Gemini on the same verified pipeline as the quiz, served from cache once made.
每张卡片按遗忘曲线安排下次复习时间。打开学习页时，到期的复习词先出现，然后才是今天的新词——顶部会明确告诉你队列是「复习 X · 新词 Y」。 Every card schedules its next review along the forgetting curve. Due reviews always come before new words, and the study page tells you exactly what's in the queue: “Review X · New Y”.
每天只有固定数量的新词名额。新词点「重来」不算学会：不建卡、不占名额，当天稍后回到队列里，直到真正学会为止。 Each day brings a fixed quota of new words. Rating a new word “Again” doesn't create a card or consume quota — it stays a new word and returns later the same day until you actually learn it.
每张卡片自评「重来 / 良好 / 简单」。「重来」的卡片回到本组末尾再出现一次，但不计入「已完成」——进度条永远不会虚高。 Rate each card Again, Good, or Easy. An “Again” card comes back at the end of its group but never counts as completed — the progress bar never lies.
学完一组而当天还有名额时，自动拉取下一组继续学；只有当天的名额全部用完，才会看到「今日任务完成」。进度统计跨组累计。 Finished a group but still have quota left? The next group loads automatically. The completion page only appears when the whole day's quota is truly done, with progress counted across groups.
内置五本词书。单词详情包含中文释义、带词性标签的英文释义、例句与近/反义词；不在词书里的词（如变形词）也会自动翻译出中文词义，并标明是词典补充内容。 Five word books built in. Word pages show Chinese definitions, English definitions with part-of-speech tags, example sentences, and synonyms/antonyms. Words outside the books (like inflected forms) get an auto-translated Chinese gloss, clearly marked as a dictionary supplement.
以 Web 应用形式开发，可安装到桌面或主屏。页面与静态资源离线缓存，学习队列与统计等接口永远直连服务器，不会拿到过期数据。 Built as a web app you can install to your desktop or home screen. Pages and static assets are cached for offline use, while study queues and stats always hit the server directly — never stale data.
学习流程A study session
从打开首页到「今日任务完成」，整条路径不需要你做任何计划。 From opening the dashboard to “day's task complete”, the path needs no planning on your part.
今日概览与学习统计一目了然。Today's overview and your study stats, at a glance.
到期的复习词先出现，然后是今天的新词。Due reviews come first, then today's new words.
重来、良好，还是简单？由你自己判断。Again, Good, or Easy — you decide.
名额没用完，就自动进入下一组。While quota remains, the next group loads on its own.
名额用完，回到首页，明天再来。Quota spent — back to the dashboard until tomorrow.
开发进展Development progress
以下内容整理自项目的开发日志与错误档案——这个项目用文档驱动开发，每一次修改都有迹可循。 Everything below is compiled from the project's development log and error archive — this project builds documentation-first, so every change leaves a trail.
当前状态：已上线，可在 www.vocabfan.online 直接使用 · 最新开发版本 v2.0（2026-08-27） Current status: live at www.vocabfan.online · latest dev version v2.0 (2026-08-27)
英文释义逐条标注词性；词书外单词自动翻译出中文词义，并注明是词典补充内容。 English definitions now carry part-of-speech tags; words outside the word books get an auto-translated Chinese gloss, marked as a dictionary supplement.
Service Worker 不再缓存 /api/* 接口，学习队列与统计永远来自服务器。 The service worker no longer caches /api/* routes; queues and stats always come straight from the server.
学完一组若当天还有名额，自动拉取下一组；完成页只在真正学完时出现，进度跨组累计。 Finish a group with quota left and the next one loads automatically; the completion page only shows when the day is truly done, with progress counted across groups.
新词点「重来」不再建卡、不再占用当天新词名额，直到真正学会为止。 Rating a new word “Again” no longer creates a card or eats the daily quota until it's actually learned.
复习优先的队列展示、进度计数与完成页文案，在这一版集中修正。 Review-first queue display, progress counting, and completion-page wording were fixed in this round.
SRS 建卡规则是纯函数并配有单元测试；词典的词性解析同样有测试覆盖。 The SRS card-creation rule is a pure function with unit tests; the dictionary's part-of-speech parsing is tested too.
Service Worker 只缓存页面与静态资源，任何 /api/* 接口一律直连服务器。 The service worker caches pages and static assets only — every /api/* request bypasses the cache.
每次修改都记录版本、文件与原因；错误与预防措施归档成册，避免重蹈覆辙。 Every change is logged with its version, files, and reasons; errors and preventions are archived so the same mistakes don't repeat.
常见问题FAQ
可以！应用已上线：浏览器打开 www.vocabfan.online，注册账号即可开始背单词，数据多端同步。本页会继续同步开发进展。 Yes! The app is live — open www.vocabfan.online in your browser, sign up and start learning; your progress syncs across devices. This page keeps tracking development progress.
在当前版本里，AI 意味着四件天天在用的功能：每个单词的 AI 讲解卡（词根拆解 + 谐音记忆 + 情景例句，如 obligation = ob 向 + lig 捆绑 →「把人捆绑住的东西」→ 责任）、秒级出题的 AI 测验（干扰项是真实易混词）、随时追问的 问 AI，以及把当日词汇串成一篇的 AI 小故事（生成走 Gemini）。此外还有按遗忘曲线安排复习的间隔重复调度。 In the current version, AI means four things you use every day: an AI explainer card for every word (morphology + homophone mnemonic + contextual sentences, e.g. obligation = ob “toward” + lig “bind” → “the thing that binds you”), second-fast AI quizzes with genuinely confusable distractors, Ask AI for instant follow-up answers, and a daily AI mini story that weaves the day's words together (generated with Gemini). On top of that, spaced-repetition scheduling along the forgetting curve.
项目内置五本词书；具体书目与词量以发布版本为准。 Five word books are built in; the exact list and word counts will be confirmed at release.
以可安装的 Web 应用（PWA）形式开发，在浏览器中即可使用，也能安装到桌面或主屏。 It's being built as an installable web app (PWA) — usable in the browser, and installable to your desktop or home screen.