It has a big serration on the edge.
边上还有很大的锯齿。
The points for attention in designing the serration axle are pointed out.
指出了渐开线螺旋花键轴几何尺寸设计时应注意得问题。
The new method for designing Fresnel lens has a wide serration breadth and unequal pitch.
用这一方法设计的菲涅耳透镜，齿宽较大，齿距不等。
Mechanical Analysis of Crack Failures in Turbine Blade and Disk Serration of an Aeroengine
某型航空发动机涡轮叶片和轮盘榫齿裂纹故障力学分析
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