UDP Datagrams can be lost or delivered in a different order to the receiving application; the error handling must be done at the application layer as well.

UDP数据包可能会丢失，或者不按顺序发送给接收的应用程序；必须在应用程序层进行错误处理。

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Are you receiving an error message when you try to log in?

你是不是在登录的时候收到了一条出错信息？

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As you can see, this is an obvious (over-simplified) example of receiving such an error.

可以看到，这是发生这种错误的明显例子(有点儿过度简化了)。

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Unlike the repeater towers that are sometimes used in western states (AKA translators), SFNs aren?t simply receiving the signal, error-correcting, and retransmitting on a different frequency.

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