想想那些你感到受骗或懊恼的时刻：某会员身份或订阅服务注册过程中畅通无阻，但随后却很难取消。
Think about the times you felt tricked or frustrated by a membership or subscription that had a seamless sign-up process but was later difficult to cancel.
在注册过程中处理错误和提示用户名。
Handling errors and suggesting user names during registration.
图8：网站告知用户在注册过程中应该会遇到什么？
Image 8: the website informs users of what is expected of them while registering.
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