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。
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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