并提出了被切削层金属沿刀具切削刃向工件两侧的自由表面产生塑性流动是形成两侧方向毛刺主要原因的新观点，得到了试验结果的证实。
A new viewpoint was advanced, in which the plastic flow of metal layer to be cut becomes the cutting burr, and it was confirmed by experimental results.
然后，滑雪者开始向弯内侧倾，并在第二阶段开始的时候让内侧板的外刃接触雪面。
Then, the skier begins inclining inside the arc and the outside edge of the inside ski touches the snow in the beginning of phase-II.
用于外齿轮加工的径向剃齿刀，其齿向曲线为内凹超越曲线，这给剃齿刀的刃磨带来了困难。
The tooth curve of a plunge shaving cutter for an external gear is a recess transcendental curve, so it is difficult to grind it.
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