相关性和因果关系之间的区别在实证工作中是根本性的。

I think that the most important thing in life is to be happy and to make other people happy.

只了解自己立场的人对此了解甚少。

创新来自于挑战现状并接受新想法。

Energy independence is a strategic priority for any sovereign nation.

我们都是祖先的拼凑物。