knife ridge

基本解释

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。
Die-cutting tool including ruled knives and knife perpendicular to the grain, the two inter-Ridge blade and height.
模切刀包括直纹刀和横纹刀，两种纹路的刀锋又有高矮之分。
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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