HSK Chinese learning system with spaced repetition mastery tracking, vocabulary analysis, and adaptive quiz generation. Use when: (1) tracking HSK vocabulary progress, (2) generating adaptive quizzes, (3) analyzing Chinese language exposure in conversations, (4) managing spaced repetition reviews. NOT for: general language learning beyond HSK, pronunciation practice, or handwriting practice.

HSK中文学习系统，支持间隔重复掌握追踪、词汇分析和自适应测验生成。适用于：（1）追踪HSK词汇掌握进度，（2）生成自适应测验，（3）分析对话中的中文语言接触量，（4）管理间隔重复复习。不适用于：超出HSK范围的通用语言学习、发音训练或书写练习。