如果应用程序无法提示发生了错误，则用户一般会认为他们的操作成功。
If the application fails to communicate that an error occurred, users generally assume that their action succeeded.
可恢复性错误——可恢复性错误是指那些可通过恰当的可选执行路径来恢复用户程序的错误。
Recoverable errors - Recoverable errors are the errors that client programs can recover from to take appropriate alternate execution paths.
这是惟一一次应用程序向用户显示网络通信错误的时候，因为在所有其他情况下应用程序已经下载并缓存了数据。
This is the only time that the application will show a network communication error to the user because the application will have downloaded and cached data under all other uses.
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