And a moist blade kept in the shower, harbouring old hair and dead skin, can lead to ingrown hairs and irritation when shaving because the blade becomes blunt.
并且放在浴室的潮湿刀片上藏匿着旧头发和死皮，使用剃刀的时候会导致毛发内生，引发刺激性反应，因为刀片变钝了。
The algorithm and formulas to determine the size of tip relief modification of pre shaving gear hobs are put forward. A principle to determine the lead width of tooth roots is also presented.
给出了剃前齿轮滚刀修缘尺寸的计算方法和计算公式，并对滚刀齿根的齿间槽宽提出了更为合理的判断原则。
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