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TreeCourse 只对斯坦福学生开放：用 @stanford.edu 邮箱收一个验证码就能登录，这样代写进不来。Stanford accounts only, which keeps 代写 (ghostwriting services) out.
- 01斯坦福邮箱Your @stanford.edu email, or Stanford Google.
- 026 位验证码We email you a one-time code. No password.
- 03扫码入群Find your course and scan its WeCom QR code.
或者用邮箱验证码 or use an email code
只接受 @stanford.edu 邮箱（不含 alumni 等子域名）。Only @stanford.edu addresses are accepted.