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旋轮线 [xuán lún xiàn]
roulette
cycloid
cycloid curve
trochoid
cycloid
cycloid curve
trochoid
- 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。
The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids. - 当一个圆沿着一条直线滚动时，圆边上一点的轨迹叫做旋轮线或摆线。
When a round object rolls along a straight line, a track on the round edge is called a roulette or a cycloid. - 这种发动机是利用内转子圆外旋轮线和外转子圆内旋轮线相结合的结构，不需曲轴、连杆和配气机构。
This engine utilizes the rotor round of epitrochoid and the outer rotor round of hypotrochoid the structure of combination, which does not need crankshaft, linkage and gas distribution agencies.
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