What is the reason for it?

原因何在?

《新英汉大辞典》

I'm giving the reason for it namely being that the sea is salt.

然后给出证明他的理由，也就是海是咸的。

youdao

But, says Singer, if a person does something antisocial, the reason for it is in the brain.

但是，辛格说，如果一个人有反社会的行为，那么原因就在他大脑中。

youdao

Unemployment in the United States edged up to 9.8 percent in September, and President Obama says the ballooning cost of health care is part of the reason for it.

VOA: standard.2009.10.03

So,that's the reason for it.

这就是人们担惊受怕的原因

耶鲁公开课 - 生物医学工程探索课程节选

So, it's Newtonian mechanics, and the reason for this is because Newtonian mechanics does not work on this very, very small size scale.

牛顿力学，因为牛顿力学,在这种很小的尺度下不适用,我们说过，牛顿力学。

麻省理工公开课 - 化学原理课程节选

The case is being widely followed, less because of the petition's rejection than the reason for it.

ECONOMIST: Sovereigns v creditors

"The FIA is not opposed to it, we are not and so what is the reason for it, " he added.

CNN: Ecclestone F1 era coming to a close - Ferrari chief

Korean Air, the world's largest cargo carrier in 2004, said it did not know the reason for the raid but said it would co-operate with the authorities.

BBC: NEWS | Business | Air cartel probe expands to Asia