以上来源于: WordNet
N a concave moulding, shaped to a quarter circle in cross section 一种棱角呈四分之一园状的凹面模型件 [architect]
When the second knife face is designed to be a non-linear face, the second knife face can be an inner cavetto line or an outer cavetto line;
当第二刀面 设计成非线性面时，可以是内凹弧线或者是外凸弧线；
The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.
传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。
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