当配重位置发生垂直移动时，通过把承重销轴穿入滑道上对应的圆孔中，实现平台的高度调整。
When the counterbalance position moves vertically, the bearing pin is penetrated through a corresponding round hole of the slide way to adjust the height of the platform.
高（低）于下滑道太多，调整下滑率。
You are well above (below) the glide path, adjust rate of descent.
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