used as a polite or respectful way of addressing a man, especially one in a position of authority
先生;长官(尤指对上级的尊称)
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excuse me, sir .劳驾,先生。
used to address a man at the beginning of a formal or business letter
先生,阁下(正式或商业信函开头的称呼)
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Dear Sir .亲爱的先生。
used as a title before the forename of a knight or baronet
爵士(用于骑士或准男爵教名之前的称号)。
another expression for
同<Bold>SIREE</Bold>.
"Middle English: reduced form of