A Label control to signal whether the message was sent or an error was encountered.

Label控件用于通知消息被发送还是遇到错误。

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In the code above, where would we signal an error?

在上面的代码中，我们在哪里报告错误呢？

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Way to reduce signal transmission error and the pipe - line arrangement.

减少信号传递误差的方法和管路布置方式。

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Error signal;

误差信号；

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Error signal;

误差信号；

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