unfortunately

柯林斯詞典

1. ADV You can use unfortunately to introduce or refer to a statement when you consider that it is sad or disappointing, or when you want to express regret. 遺憾地[情感]
Unfortunately, my time is limited. 遺憾的是，我的時間有限。
Unfortunately for him, his title brought obligations as well as privileges. 對他來說遺憾的是，他的頭銜既帶來了特權(quán)也帶來了義務。

Journalists may enter the danger zone but unfortunately we cannot guarantee their safety .
Unfortunately we can't come this evening after all.
Unfortunately there's nothing I can do about your problem .
We tried to get tickets , but unfortunately they were already sold out.
Unfortunately the plane has been delayed - the new departure time is 16.20.