sad形容词的副词形式

Sadly, the film is let down by an excessively simple plot.

遗憾的是，过于简单的情节使得这部电影差强人意。

Sadly, most of the house was destroyed by fire in 1828.

遗憾的是，这座房屋在1828年的`火灾中大部分被烧毁。

Sadly, the project has now been shelved.

不幸的是，计划现在已经搁浅。