B2 实际上，事实上
really
I thought she was Portuguese, but in actual fact she's Brazilian. 我以为她是葡萄牙人，可实际上她是巴西人。
I realized that in actual fact the event took place a day later than I'd thought.
He told us he was at his friend's when in actual fact he was at Anna's house.
Patients thought they were getting the new drug. In actual fact, they weren't.
See also: actual