"Sir" is a title used before a man's name, used as a formal and respectful address, originally used to address a knight. For example: "Sir, may I help you?"
"Mr." is an abbreviation of "Mister", which is a title used before a man's name and is used to address a man in a polite or respectful way. For example: "Mr. Smith, how are you today?"
Both "Sir" and "Mr." are commonly used in English-speaking countries, and the choice between the two often depends on the context and the level of formality required in the situation.
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最佳回答 2023-09-17