... 双抱掌 holding-gall palm 片旋掌 rotating palm 背身掌 turnning-back palm ...
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rotating palm
旋转的手掌
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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The Spheres are used by rotating them in the palm of the hand with the fingers.
健身球的使用方法是将球握在手中用手指捻转。
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