“原因在于，”他说，“这个体系存在深层次和根本性的缺陷。”

"The reason," he said, "is because the system is deeply and fundamentally flawed."

youdao

但是，这些积极行动的根本原因当然不全是出于经济目的。

However, the rationale for such initiatives is not, of course, solely economic.

《柯林斯英汉双解大词典》

排放过多温室气体，如二氧化碳，是全球变暖的根本原因。

Emitting too much greenhouse gases such as carbon dioxide lies at the root of global warming.

youdao

And i think this is the goal of my lifetime to at some point be able to reach the bottom.

可以说，找到这其中的根本原因,是我一生的所求。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

For the simple reason that the number of possible chess games is so huge, that computers can't calculate it.

原因很简单,棋局的潜在变数相当之大,以至于计算机根本无法将其完全计算出来

耶鲁公开课 - 死亡课程节选

There must be fundamental reasons for it and I wanted to go over some of the fundamental reasons why we have banks.

它的形成必有其根本的原因,下面我就阐述银行产生的一些基本原因,为什么会有银行

耶鲁公开课 - 金融市场课程节选