in fact等于短语in reality，in practice，as a matter of fact
例句
1、
I didn't fail the exam in fact I did rather well!
我没有考不及格，事实上，我考得不错！
2、
In fact， things could get worse in the short run.
事实上，事情在短期内可能会变得更加糟糕。
3、
The theory seems to have no basis in fact.
这一理论似乎没有事实根据。