An outer gear that revolves about a central sun gear of an epicyclic train.
围绕本轮列车的中心齿轮旋转的外部齿轮。
However, its efficiency is lower than that of the epicyclic gear train, so it should be used in some small power transmissions.
但它的效率较低，故限用于小功率、大速比的传动。
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