他的古怪行为一定事出有因。

There has to be a reason for his strange behaviour.

《牛津词典》

尽管这些人辞职各自有因，但专家表示这种行为存在一定风险。

They quit for different reasons, but experts suggest that such a move *entails certain risks.

youdao

意定代理中授权行为的独立性是一个被前人发现的客观事实，授权行为的独立性问题是探讨授权内无因性的前提。

The independence of the act of authorization in the voluntary agency is an objective fact, and it is the premise to probe the non-causative nature within the act of authorization.

youdao