首次使用——设置首位教师：First time — set up the first teacher:
WelcomePick a lesson to begin
Lv 1
Listening… 正在听
Settings
Add a free Gemini key (or any OpenAI-compatible API) to unlock unlimited free-form conversation with your AI teacher. Your API key is stored in this browser only and is never uploaded.
Get a free Gemini key ↗ — sign in with Google, tap “Create API key”, copy it, then tap the button above and paste it into API Key.
Get a free Groq key ↗ — sign in, tap “Create API Key”, copy it and paste it here. No card needed.
Learning pace
Free Chat and Live always use your AI key.
What you tell me in chats (name, country, city, hobbies) stays on this device.
Instructions are read aloud in English; Chinese example sentences are read in Chinese. Tap the 🔊 / EN buttons on any bubble to replay.
Course progress
Clears your completed ticks, the resume point and the finished-tour flag — XP, level, streak, mistakes, saved words and settings are kept.
App version: v156
Live Voice Practice Requires an API Key · 语音通话需要 API Key
To chat with AI Live, please enter your API Key in Settings. Your key stays in this browser only. 要进行 AI 语音通话，请先在「Settings 设置」里填入你的 API Key。Key 只保存在本机浏览器。
Use AI in My Lessons · 课堂里用 AI
Your recordings will be sent to Groq (if you added a Groq key) or the AI provider you configured in Settings — to mark them (Android phones) and to point out which sound was off when a reading is marked wrong. Same privacy policy as your AI chats; nothing goes anywhere else. 你的录音会发送到 Groq（如果你填了 Groq Key）或你在 Settings 里配置的 AI 服务商——用来判分（安卓手机）、在读错时指出哪个音不对。与 AI 对话同一隐私政策，不会发送到任何其它地方。
NPCR 3 Live Practice Preview · NPCR 3 语音练习预览
Live Voice Practice for NPCR 3 is currently using generic NPCR 3 conversational bounds (no lesson-specific vocabulary yet). NPCR 3 的语音练习目前使用 NPCR 3 通用会话边界（暂无逐课词汇范围）。
选择课本 · Choose your course
选一次就好，之后只看到这一本课本；想换随时点「换课程 Change Course」。
Pick it once — from then on you’ll only see this textbook. You can change it any time.