Dashu saw dad shaving in the morning, he wanted some too. Dad gave him a bit of foam at the tip of his nose.

爸爸早上刮胡子被大树看到了，他也要求要刮。爸爸在他的鼻头点了一点泡沫。

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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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