1、当as作介词时意思是“作为”，例句为：French is known as the most beautiful language in the world.意思为：法语以世界上最优美的语言著称。 2、当as做关系代词时，引导定语从句，例句为：This is the same game as I played yesterday.意思为：这和我昨天玩的游戏一样。 3、当as作连词时...