sir
英 [sɜː]
[NOUN]
1. 敬启者（常用于正式函件或商务函件）
You use the expression Dear Sir at the beginning of a formal letter or a business letter when you are writing to a man.
双语例句
例：Dear Sir, Enclosed is a copy of my CV for your consideration.
尊敬的阁下，兹附上我的简历一份，请予以考虑。
CONVENTION. 习惯表达
sirs
1. [C 可数名词] 先生（对男性的客气称呼）
People sometimes say sir as a polite way of addressing a man whose name they do not know, or an older man. For example, a shop assistant might address a male customer as sir.
双语例句
例：Excuse me sir, but would you mind telling me what sort of car that is?
打扰一下，先生，您能告诉我那是什么类型的汽车吗？
2. [C 可数名词] （爵士或从男爵名字前的头衔）爵士
Sir is the title used in front of the name of a knight or baronet.
双语例句
例：She introduced me to Sir Tobias and Lady Clarke.
她把我介绍给托拜厄斯爵士和克拉克夫人。
NOUN. 名词
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