to be at the bottom of something
01
是真正原因, 是背后的原因
to be the direct cause of something, particularly something unpleasant
习语
非正式
例子
The detective believed that a personal grudge was at the bottom of the crime.
金钱问题才是他们大多数争吵的真正原因。
是真正原因, 是背后的原因
金钱问题才是他们大多数争吵的真正原因。