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。

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The reason is that their motion is relative, and relativity.

其原因是在于它们运动是相对的；

youdao

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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And that's one reason why Research In Motion 's BlackBerry devices remain a must-have for any road warrior.

FORBES: Magazine Article

And that's one reason why Research In Motion 's (nasdaq: RIMM - news - people ) BlackBerry devices remain a must-have for any road warrior.

FORBES: Top Of The Toybox