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。

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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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The method and the device enable the materials to be dried to move to and fro from the drying roller to the sleeve, prolong the time of the material in the drying device and fully dry the material.

本发明使待烘干的物料经烘干滚筒至套筒往返移动，延长物料在烘干装置的时间，使物料得到充分干燥。

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The fluids exerted a drag, causing the samples to move to and fro at the same frequency with which the machine jiggled, but with a slight delay.

ECONOMIST: How tree frogs keep their grip