Teach a field, concept, or paper through one-question-at-a-time dialogue, Feynman explanations, and evidence-based assessment; query or resume persistent learning records across sessions. Use for 开始学习, 带我学, 学过没有, 学习进度, 继续学习, or 重新学 with learning intent. Includes opt-in capture and offline-sync helpers; distinct from generating a one-shot report or teaching video.
