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The piston completes a stroke each time(that)it changes direction of motion.
每当活塞改变一次运动方向时，它就完成了一个冲程。
youdao
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The orientation of the lip and the direction of the piston rod are same.
所述唇边的朝向与活塞杆的方向相同。
youdao
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The orientation of the lip and the direction of the piston rod are same.
所述唇边的朝向与活塞杆的方向相同。
youdao