关于磨刀
这样的刀是磨单面还是磨双面http://qbj.nycqbz.com/pic/20190129/1548738830153673857.jpg?watermark/1/image/aHR0cDovL3Fiai5ueWNxYnouY29tL3BpYy8yMDE4MTEyMC9xaV9uaXVfMTU0MjY5OTEyNTY2OV8xNjNfOTYyXzg1NC5wbmc=/dissolve/50/gravity/SouthEast/dx/20/dy/20
都可以吧 单面 简单一点
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