事实上用英语可以表示为as a matter of fact，in fact，in reality，in truth等等。
例句：
1.然后他们事实上也毒打了她一顿。

Then they actually beat her up as well. 

2.事实上，以后再办这件事可能要明智得多。

Actually, it would be much more sensible to do it later. 

3.“事实上，不是那样发生的，”乔治纠正我。

"Actually, that isn't what happened," George corrects me. 

4.事实上，他的离去几乎没被注意到。

His departure, in fact, went almost unremarked. 

5.我没有考不及格，事实上，我考得不错！

I didn't fail the exam; in fact I did rather well! 

6.珀尔不介意他的沉默，事实上她喜欢这一点。

Pearl didn't mind his reticence; in fact she liked it.