管道是一个有向图，媒体在这个有向图中从输入流到输出。
A pipeline is a directed graph in which media flows in a defined direction from the input to the output.
最后，关闭输入流，清空输出流，如果输出流是管道，则用pclose函数关闭它。
Finally, close the input stream, flush the output stream, and if it was a pipe, close it with the pclose function.
最后，关闭输入流，清空输出流，如果输出流是管道，则用pclose函数关闭它。
Finally, close the input stream, flush the output stream, and if it was a pipe, close it with the pclose function.
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