在带宽不对称网络中，反向带宽的不足限制了反馈信息的返回，导致TCP性能的大大下降。

In the bandwidth asymmetric network, the deficiency of the bandwidth on backward path will limit the return of the feedback information, resulting in the degradation of the TCP performance.

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客户机现在可以将带宽元素修改为所需的值，然后反向执行文件传输过程，从客户机发送到服务器。

The client can now modify the bandwidth element to the required value, then the file-transfer process occurs in reverse, from the client back to the server.

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