... 椭性抛物面 elliptic paraboloid 椭圆活塞 elliptic piston 椭圆偏光，椭圆极化 elliptic polarization ...
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To improve performs of engine, the piston skirt curve is designed to be middle convex and varied elliptic pattern, copying manufacturing with master piston is commonly used.
为提高工作性能，活塞裙部设计成中凸变椭圆型，立体靠模仿形车削是常用的加工方法。
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