误差信号；
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。
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？
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。
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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