The reason is that their motion is relative, and relativity, as we have seen, means that we have a choice.
理由就是他们的运动是相对的。正如我们所理解的那样，相对论就意味着我们可以选用一种解释了。
The reason of rend and unstable running of cone lining was found through analysis of cone crusher by using the principle of dynamic and motion. The methods for solving the problems were raised.
运用动力学和运动学原理，对圆锥破碎机进行了运动和受力分析，找出了锥形衬套产生裂纹及运动不稳定的原因，并提出了解决问题的方法。
The symmetry vortex of water induced by particle clouds does not synchronize with the motion of particle clouds, and the symmetry vortex is the key reason for clouds to disperse.
泥沙云团在加速下沉阶段所引起水的对称涡与泥沙云团的运动是不同步的，对称涡是引起泥沙云团扩散的重要因素。
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