n.先生；（用于姓名前）爵士；（中小学生对男教师的称呼）先生；老师 变形： 复数：sirs 双语释义：n.(名词)[C] 先生 (used as a polite way of addressing a man)[C] 爵士 (title used before the first name of a knight or baronet)英英释义： sirn.term of address for a mana title used before the name of knight or baronet