When a user goes down a logical dead end (rather than merely mistyping data), he can often proceed several complex steps into the unknown before realizing that he is lost and needs to get a bearing on known territory.

• 当用户进入逻辑的死胡同（而不是简单的输入数据错误）时，通常执行了几个复杂的步骤。 在意识到自己迷路之前，已经来到了一个未知的世界，他需要返回已知世界。