在推力轴承下圈垫上调心垫圈，可使吊钩相对连接筒在任意方向上摆动。
A core regulating pad ring is padded on the lower ring of the thrust bearing, which can make the hook swing in any directions corresponding to the connecting cylinder.
膝盖和脚应当向上刚好摆动到水面的位置，然后就应当向下摆。
You want you knees and your feet to just kind of come to the surface, and then go back down.
本例中，咱们将约束其只在水平方向上单独摆动。
In this case, we want to restrict the wiggling to the horizontal direction only.
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