根本原因英文：primary cause。
例句：
1、汤姆失败的根本原因是懒惰。
The primary cause of Tom's failure is his laziness.
2、不幸的是，由于这种方法未能解决通胀的根本原因，工资和价格控制最终崩溃，迄今为止受到压制的通胀再次出现。
Unfortunately, because this approach fails to deal with the underlying causes of inflation, wage and price controls eventually collapse, the hitherto-repressed inflation resurfaces.
3、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.
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