unfortunately

柯林斯词典

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. 遗憾地[情感]
Unfortunately, my time is limited. 遗憾的是，我的时间有限。
Unfortunately for him, his title brought obligations as well as privileges. 对他来说遗憾的是，他的头衔既带来了特权也带来了义务。

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.