He continued to move to and fro over the soft carpet.
他继续在柔软的地毯上来回走动。
It is a disc or collar with an irregularly shaped edge, which operates in contact with a rod or lever, and causes it to oscillate, or to move to and fro.
它是一个不规则形的圆碟或圆环,和一个杆或棒连接运作,使它上下或往来摆动。
The 8 piston bodies move to and fro, in and out, and drive the crankshaft to rotate continuously, then the power is output by the engagement of conic gears.
八个活塞体来回内外运动,带动曲轴连续旋转,再通过多对锥齿轮相互啮合的方式,实现动力的输出。
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