Because the standard input and the standard output of the remote command are tied to your keyboard and display, albeit through the magic of SSH.
这是因为远程命令的标准输入和标准输出都绑定到了您的键盘和显示器，这正是SSH的神奇之处。
Remote execution also emulates the standard input, output, and error of the client host.
远程执行还模拟客户端主机的标准输入、输出和错误。
The standard input and output of the remote host are replicated to the local machine, so the output from the command can be filtered locally, as shown here in Listing 4.
已经将远程主机的标准输入和输出复制到了本地计算机，所以可以在本地对该命令的输出进行筛选，如清单4中所示。
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