forward and backward movement knob 载物台前后运动螺旋
Forward and backward movement, meanwhile, was a bit harder to coordinate because of the lag time half way around the globe, Mr. Garriott DE Cayeux says.
理查德说，不过由于横跨近半个地球的时间滞后问题，前后滑动的动作有点难以协调。
CR-Finishing Film is automatically rewinded. Two groups of ballscrew linear guideway are equipped for the forward and backward movement of polishing head.
抛光砂纸带自动收卷，抛头进、退采用滚珠直线导轨两层工作平台。
The powerful extension of the leg downward and backward creates the horizontal movement forward.
腿向下和向后有力的伸展产生向前的水平运动。
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