It is difficult to not find a causal relationship.

发现不出这样的因果关系是很困难的。

youdao

However, they stressed that they could not find a causal link.

但他们无法找出具体的联系。

youdao

However, they stressed that they could not find a causal link.

但他们无法找出具体的联系。

youdao