rotary roughening

例句：

1. 1. The machine hasa rotary dial for adjusting thespeed.
   这台机器有一个旋转拨号盘来调整速度。
2. 2. The car has a rotary gearbox that allows for easy shifting.
   这辆车有一个旋转齿轮箱，可以方便地换挡。
3. 3. The rotary valveis used to control the flow of gases in industrial processes.
   旋转阀门用于控制工业过程中气体的流量。