数据通信中，由接收方向发送方传送应答字符作为肯定回答的传输过程。
In data communications, the transmission by a receiver of acknowledge characters as an affirmative response to a sender.
处理程序只需使用字符串 newBody 替换应答主体，如下所示。
The handler simply replaces the reply body with the string newBody, as shown.
应答信号通常是一个保留的ASCII字符。
The ACK signal is usually an ASCII character that is reserved for that purpose.
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