The principal reason for this omission is lack of time.

跳过它的主要原因是时间不足。

《牛津词典》

The principal reason for my change of mind is this.

我改变主意的最重要原因就是这个。

《柯林斯英汉双解大词典》

The reason for the interview is twofold: we want to find out what he can tell us, plus we also want to find out what condition he is in.

这一采访的原因有两个：我们既想看看他能告诉我们些什么，也想弄清他的处境如何。

《柯林斯英汉双解大词典》

The report says one reason for the growing deadliness of cancer is more people smoking cigarettes in developing countries.

VOA: special.2009.01.13

What do you think the reason is for that?

你觉得这是什么原因呢？

成绩不是全部 - SpeakingMax英语口语达人

Is Milton powerful for the very straightforward reason that he's in possession of this tremendous literary strength, this unimaginable talent?

弥尔顿之所以强大是因为他有,无穷的文学力量，不可想象的天赋这显而易见的原因呢？

耶鲁公开课 - 弥尔顿课程节选

The reason is for the betterment of the plan participants and for the company owner or Board of Directors avoid looking foolish in a deposition.

FORBES: Who's On The Hook For Decisions Made In Your 401(k)?

No matter what the reason is for the sudden change in your job responsibilities, you need to maintain a positive attitude, talk to your supervisor and refrain from complaining, among other thing.

FORBES: What To Do When They Radically Change Your Job

Although people's desire for abundant, cheap food is the big reason for intensive modern farming, another is the taste for variety that has come from affluence and from fast, cheaper transport.

ECONOMIST: They’re burning animals again | The