角动量守恒，惯量，平行轴原理。
Conservation of angular momentum, moment of inertia, parallel axis theorem.
推转项的引入破坏了时间反演对称性，单粒子角动量在内禀对称轴上的投影量子数已不再是好量子数。
The cranking term breaks the time reversal symmetry, and the projection of the single particle angular momentum on the intrinsic symmetric axis is no longer a good quantum number.
此外，轴外传输的孤子会获得附加的角动量。
Moreover, additional angular momenta are added to the off-axis propagating solitons.
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