主要原因英语

主要原因The main reason.

英语很简单又直白，表达主要原因的例子:The accident was caused by the main reason that driver drunken. 想表达根本原因可以不要用同一个单词reason ，例子：The root cause of the car accident is that the driver has been drunken.

Main cause主要原因The main reason主要原因primary cause主要原因

major reason