When using knives, should the blade down, the index finger ridge cut by the knife.

在使用刀时，应刀刃向下、食指按在刀脊上切割。

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The helical ridge cleaning device is arranged in front of an opener, and mainly comprises a cutter shaft and a circular knife welded on the cutter shaft;

所述螺旋型垄台清理装置安装于开沟器正前方，主要由刀轴以及焊接在刀轴上的螺旋刀组成；

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