stderr is the standard error stream, which displays error output from commands.
stderr 是标准错误流，显示命令中的错误输出。
Makes the standard error stream write to the pipe to the multilog process that is already connected to the standard output stream.
让标准错误流写入到multilog进程的管道，这个管道已经连接到了标准输出流。
If you've been paying attention, you've probably noticed that the standard error (stderr) stream isn't represented in any of those examples.
如果您仔细观察，那么可能会发现，前面的这些示例中并没有出现标准错误(stderr)流。
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