What actually is the causal relationship.

什么是因果关系？

We never get to the causal relationship itself.

我们不会看到因果关系本身。

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。

So all we see are correlation we never see the causal relationship itself.

我们看到的都是相关性,我们从没看到因果关系本身。

But there is little academically accepted evidence of a causal relationship.

但是，没有理论能够证明二者之间的因果关系。