Asynchronous server to send UDP packet, the client received UDP packet and write.

服务器端异步地发出UDP包，客户端接受UD P包并写入。

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If you need the acceptance letter before you can get the financial documents, then please write a note to the school stating this fact and include it with your application packet.

如果你需要在你得到财务文件之前就有接收信，请给学校写封信说明这一事实，将其附在你的申请文件里。

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