knight作“爵士”解时,其称号用Sir。

Have you read about King Arthur and Knights of the Round Table?你读过《亚瑟王和他的圆桌武士》的故事吗?
Sir George was made a knight for his service to his country.乔治因对国家有贡献而受封为爵士。

knight还可用作及物动词,意思是“授以爵位”。