sir
definitions
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noun
a polite form of address for a man, especially one of high rank or in a formal settingzh: 先生
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noun
a title for a knight or high-ranking officialzh: 爵士
examples
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Sir, may I ask a question?
先生,我可以问个问题吗?
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Sir Arthur was a brave knight.
亚瑟爵士是一位勇敢的骑士。