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。
2
The listen and close methods open and close an input pipe, respectively.
listen和close方法分别打开和关闭输入管道。
3
Check any pipes that run close to outside walls. Put some fiberglass insulation or rockwool between the pipe and the wall to help keep the cold away from the pipe.