The moving reference frame is used in the impeller region and the boundary conditions are velocity inlet and pressure outlet.

在计算时对于叶轮区域采用旋转参考系的方式，边界条件分别是进口速度边界条件以及出口压力边界条件。

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The possibility of explaining time dilation as a dynamic cause-and-effect phenomenon is explored by calculating the rates of clocks in a stationary and in a moving reference frame.

通过计算静止时钟和运动时钟的时率，探讨了把时间膨胀解释为一种动力因果效应的可能性。

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