1. The smoke from the fire blackened the walls of the house.
火烟使房屋的墙壁变黑了。

2. Her reputation was blackened by baseless accusations.
她的声誉因无根据的指控而受到了玷污。

3. The scandal blackened the politician's reputation beyond repair.
这起丑闻使政治家的声誉恶化到不可挽救的地步。