By using the relation between unlimited rotation and angular momentum, this article derives the commutation relation of angular momentum operators.

本文利用无穷小旋转与角动量之间的关系来推导角动量算符的对易关系。

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The amount of angular momentum, say, a spinning skater has depends on both the speed of rotation, and the weight and distribution of mass around the center.

角动量的大小，取决于旋转中的滑冰选手的旋转速度、体重和绕旋转中心的质量分布。

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This quick rotation powered a strong magnetic field, which heated the sun’s atmosphere and carried away mass and angular momentum in a strong solar wind of charged particles.

这个磁场加热了太阳的大气层并且带走了由带电粒子（charged particle）组成的强大太阳风的质量（mass）和角动量（angularmomentum）。

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