main cause

原因───reason;主要───main

That's the only reason I'm actually going.───这是我确实要走的唯一理由。

I'd like to know the reason why you're so late.───我想知道你为什么迟到那么长时间。

My main reason for subscribing to New Scientist is to keep abreast of advances in science.───我订阅《新科学家》主要是为了了解科学的最新进展。

I had a bad night; I went to bed early enough, but for some reason I couldn't get off to sleep.───我夜里睡得很不好, 上床相当早, 可是不知为什么睡不着.

I'm not learning Arabic for any special reason; I'm doing it for its own sake, because I enjoy it.───我学习阿拉伯语没有特别的理由, 就是 因为喜欢而学习.

Tell me the when and the why ( = reason ) of it.───请告诉我时间和原因.

There's no other reason.───非有他故.

I'll do any thing within reason to oblige.───凡能做到的我都愿效劳[尽力].