练习： 试找出一个立方体可能的旋转对称轴（除自身对称操作外） 亦称旋转反伸轴，又称反轴或反演轴（inversion axis）等。是一种复合的 对称要素。
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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.
将神经网络、遗传算法、三轴实验和离散元数值模拟相结合，用于改性砂土等效离散元接触模型参数反演。
The inversion method combining the genetic neural network and the discrete element simulation of triaxial tests is proposed for determining the contact model parameters of the conditioned soil.
文章介绍了离轴式米散射激光雷达系统的重叠因子，结合自行研制的一台激光雷达系统的技术参数，给出重叠因子的理论计算结果及实验反演结果。
Based on our Mie-scattering lidar system and its technical parameter, the results of the overlap function are calculated in two ways, which is approximatetly equivalent.
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