植物非光滑叶表形态中凸包处硬度较凹坑处的硬度大；
The hardness of convex hull is higher than that of pit portion on the sculptured leaf surfaces.
有压管道中凸体绕流的势流一般解可采用解析函数在辅助平面上获得。
The general solution for potential flow past irregularities im a pressure conduit can be obtained in auxiliary plane by use of analytic functional theory.
当今对中凸变椭圆活塞进行加工主要是使用添加直线电机为U轴的车床进行加工。
A lathe with a line motor as U axis is usually used to cut the piston.
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