使文件内容反向排列并不是常见的任务，但是以下几个一行程序显示了- n开关和- p开关并不总是处理整个文件的最佳选择。
Reversing the contents of a file is not a common task, but the following one-liners show than the -n and -p switches are not always the best choice when processing an entire file.
可换向进料导向机构和通过行程开关自动改变电机的转向，从而实现转子正反向工作，大大延长易损件的使用寿命；
Reversible rotor extends a much longer service life of wearing parts due to the reversible feed guiding mechanism and the automatic changing of motor rotation direction by dint of limited switches.
可换向进料导向机构和通过行程开关自动改变电机的转向，从而实现转子正反向工作，大大延长易损件的使用寿命；
Reversible rotor extends a much longer service life of wearing parts due to the reversible feed guiding mechanism and the automatic changing of motor rotation direction by dint of limited switches.
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