For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
When an MLG is extended, a side-stay assembly prevents sideways movement of the MLG and helps keep it extended.
当主起落架伸出时，一部侧向保持组件防止起落架侧向移动，并帮助保持在伸出位置。
The benefit of wearing a turban is that when you wrap the 5 to 7 layers of cloth, you cover the temples, which prevents any variance or movement in the different parts of the skull.
带长头巾的好处是当你包至5到7层时，你包住了太阳穴，这将防止头颅的不同部分有移位或活动。
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