剪牙要剪成平齿，不伤及牙龈，防止细菌感染；

Cut cut teeth to cut teeth and gums, don't hurt, prevent bacteria infections;

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介绍了平齿根齿侧配合英制渐开线花键计算、测量的基本公式及方法。

This paper introduces calculation and measurement of BRITISH Standard Involute splines.

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锯片呈平齿交叉斜齿，具有防反弹的保护设计，适用于切割各种有树节的干燥软、硬材。

Saw blades with alternate top bevel teeth and anti-kicking back device, are suitable for cutting soft and hard wood with knots.

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