sad的副词怎么写

　　Sadly when the lid of the boot sprang open, it was empty.

　　不幸的是，当后备箱的盖子弹开时，里面却是空的。

　　Sadly, the feud sums up the relationship between Lord Bath and the man who succeeds him.

　　不幸的是，巴思勋爵和他的继任者之间的关系只能用“积怨已久”来概括。

　　She recollected sadly that she used to have dinner with him in that restaurant.

　　她伤心地回忆起，她以前常和他去那个餐厅吃晚饭。

　　He must be sadly lacking in intelligence.

　　他的智力一定极为贫乏。

　　Sadly, my acquaintance with Spanish literature is limited.

　　可悲的是，我对西班牙文学的了解是有限的。