其原因是在于它们运动是相对的；
The reason is that their motion is relative, and relativity.
如果我们知道原因是在于我们渴望被关注，就没有必要了。
Not necessarily so if we know the reasons behind our desire for attention.
为什么……？第一个原因是……；第二个原因是……；第三个原因是……。总的来说，……的主要原因在于……。
Why...? The first reason is that...; the second reason is that... the third is... all in all, the main cause of... is that...
为什么……？第一个原因是……；第二个原因是……；第三个原因是……。总的来说，……的主要原因在于……。
Why...? The first reason is that...; the second reason is that... the third is... all in all, the main cause of... is that...
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