跳过它的主要原因是时间不足。

The principal reason for this omission is lack of time.

《牛津词典》

最后，2005年以来玉米价格暴涨的主要原因是对全球变暖的担忧，这一点被克鲁格曼轻易地漏掉了。

Finally, Krugman conveniently forgets that concerns about global warming are the main reason that corn prices have skyrocketed since 2005.

youdao

我订阅《新科学家》的主要原因是要跟上科学的进步。

My main reason for subscribing to New Scientist is to keep abreast of advances in science.

《柯林斯英汉双解大词典》

The Washington Post surveyed its readership and discovered that ask people what they thought was the most significant causes of the shooting.

华盛顿邮报》在读者中进行了调查,并且发现当询问人们,他们认为,枪杀案发生的主要原因是什么。

麻省理工公开课 - 媒体、教育、市场课程节选

So practicing is the main thing why I'm here.

所以，练习英语是我来这儿的主要原因。

学习英语的理由 - SpeakingMax英语口语达人

And the reason for this was mostly to, because we realized that the people around you, at your school, are the people who you want to look at mostly anyway.

这样做的原因主要是，我们发现，人们更乐于去了解同校生,或者身边的人的信息。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选