expression · in fact; in reality; used to clarify the truth of a situation, often in contrast to expectations

很多人以为他很穷，但事实上他很有钱。

noun, expression · as a matter of fact; actually; in reality

事实上，我根本不知道这件事。

expression · existing in practice or by the very nature of the circumstances, whether or not officially recognized

虽然没有正式的任命，但他事实上已经成为了这个部门的负责人。