Interactive lessons · ⁨互动课程⁩

Learn · ⁨学习⁩

Short lessons that teach a topic, then quick exercises to check you understand. · ⁨讲解主题的短课，随后进行快速练习以检验理解。⁩

Every subtopic · ⁨每个子主题⁩Mixed exercises · ⁨混合练习⁩Instant feedback · ⁨即时反馈⁩

Learning path · ⁨学习路径⁩ AI Learn · ⁨AI 学习⁩ A guided path through each subject: clips, things to try, and the real questions · ⁨各学科引导路径：包含视频片段、实践练习及真实考题⁩

Tips · ⁨提示⁩

Lessons teach one idea at a time. After each step there is a short question, and you find out straight away if you got it right. · ⁨课程按单一概念逐步教学。每完成一步后有一个小测验，你能立即知道自己是否正确。⁩

Use the notes when you want the whole topic in one place. Use a lesson when one point will not stick — it goes slower, with worked steps and things you can change and try. · ⁨当你需要一个知识点的完整总结时使用笔记；当某个要点难以掌握时使用课程——它节奏更慢，包含逐步讲解，并提供可修改尝试的练习。⁩

Everything is free, needs no account, and pairs every translated reading language with English · ⁨英语⁩. · ⁨所有内容均免费，无需 注册账户，并将每种翻译语言与英文配对呈现。⁩