a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis 同义词：epicyclic gear train,
例句与用法
1.
Three sets of epicyclic train were adopted by the robot to be served as the walking components and the adjusting mechanism for the radial dimensions and to be evenly distributed along the circumference 机器人采用三组行星轮系作为行走部件和径向尺寸调节机构，并沿圆周均匀分布。
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