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英汉例句

\ 旋轮线的例句（旋轮线在句子中的用法）

旋轮线的例句（旋轮线在句子中的用法）

He investigates geometrical properties of cycloids , epicycloids, and hypocycloids. 他研究了摆线、圆外旋轮线和四点圆的旋轮线的几何性质.
The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids. 曾经盛行的托勒密地心说体系里的行星轨道就是外旋轮线.

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