旋转的角动量有，稳定事物的性质。
So spin angular momentum has the property of stabilizing things.
研究了多极透镜与旋转对称透镜组合系统的基本性质。
The elementary properties of the system combining a multipole len with a round len are studied.
本文利用SO（3）旋转群性质得到了非线性双折射介质模型的一个严格解。
An exact solution for the nonlinear birefringent medium model is obtained by using SO(3) rotation group property.
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