unfortunately

Unfortunately, we missed the last train and had to take an expensive taxi.

(Chinese) 不幸的是，我们错过了最后一班火车，不得不打了一辆昂的出租车。

I wanted to attend the party, but unfortunately, I have to work late tonight.

(Chinese) 我想参加派对，但不幸的是，我今晚必须加班。