Each time a corresponding client socket contains any read, write or error operations, the corresponding callback function is called.

每当对应的客户端套接字包含读、写或错误操作时，调用对应的回调函数。

youdao

Each channel has a predefined function and is either a read channel or a write channel.

每个通道都是一个预定义的函数，它可能是一个读通道，也可能是一个写通道。

youdao

The callback function can read the records that were saved in named memory (7) and write each record to a file (8).

回调函数可以读取保存在已命名内存中的记录(7)并将每条记录写入一个文件(8)。

youdao