我的坚定信念，一切发生的一个原因只有一个。

I'm of the firm belief that everything happens to one for a reason.

youdao

这种状况发生的一个原因可能在于青年人在学校或者大学里学习的时间更长，这样兼职工作的时间就更少。

It may have happened because teenagers are staying at school or college longer, and are working less on the side.

youdao

他们的发现支持这样的观点，即所谓的内质网（ER）应激性与机体自然处理的方式是一致的，该方式是破裂发生的一个原因。

Their finding supports the idea that so-called endoplasmic reticulum (ER) stress together with the body's natural way of coping with that stress is one reason why the rupture takes place.

youdao

So, shielding happens when you have more than one electron in an atom, and the reason that it's happening is because you're actually canceling out some of that positive charge from the nucleus or that attractive force with a repulsive force between two electrons.

所以当你们在原子中有多于一个电子,屏蔽就会发生，它之所以会发生的原因是,你们实际上抵消了,一些来自原子核的正电荷,或者来自吸引力,在两个电子之间。

麻省理工公开课 - 化学原理课程节选

The other is that some places where the disease occurs the governments are not stable, or there might be civil unrest or civil wars and that makes it very difficult to orchestrate giving vaccines when there's other things happening in the country that are of more immediate concern.

另一个原因是,一些疾病发生地区,当地的政局不那么稳定,或者有动乱和内战,当在一个国家内发生许多,突发应急事件的时候,疫苗的分派发放会变得非常困难

耶鲁公开课 - 生物医学工程探索课程节选