It's all about rotational mechanics. When you turn your hands over you're rotating them around their centre point, which is near the middle of your palm.
这是一个力学常识，当你翻转手掌时，手掌是以掌心为中心旋转地。
It's all about rotational mechanics. When you turn your hands over you're rotating them around their centre point, which is near the middle of your palm.
这是一个力学常识，当你翻转手掌时，手掌是以掌心为中心旋转地。
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