观看免费视频 When You Crack Your Knuckles

(9.11 MB) 添加日期19 Feb 2018 播放155次 教育 Tutorial How it works Health
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When You Crack Your Knuckles

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qunload | stop

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shift + ←→slower / faster

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动画说明：

Here's what happens to your knuckles when you crack them.