旅行，生命这没有回程的运动场。
卡拉·弗雷·杜斯说，她离开阿拉巴马的家时根本没带回程路费，因为这场运动深深打动了她。
Carla Fraydus said she left her home in Alabama without money to return, because she feels so strongly about the movement.
提供了一种少齿数齿轮传动系统输出运动误差和回程误差角的计算方法。
A kind of calculation method for outputting motion error and return stroke error Angle of less toothed gear drive system was provided.
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