B1 used as a formal and polite way of speaking to a man, especially one who you are providing a service to or who is in a position of authority先生
mainly UK sometimes used by children to address or refer to teachers who are men(孩子对男性教师的称呼)老师
Indian English used after the name of a man, especially one who is in a position of authority, in order to be polite or show respect(用于男性、特别是权威人士的名字之后,用以表示礼貌或尊敬)先生
B2 used to begin a formal letter to a man whose name you do not know. "Dear Sirs" is an old fashioned way of beginning a letter to a company.尊敬的先生(用于正式信函中称呼不知姓名的男性收信人;Dear sirs,即尊敬的各位先生,为正式商务信函的旧式信首称呼语)
used to begin a formal letter when you do not know if the person you are writing to is a man or a woman尊敬的先生或女士,敬启者(用于正式信函中称呼不知性别的收信人)
More examples
Come hither, young sir!
I'm sorry, sir, the salmon is off.
Officer Clarke will show you where to go, sir.
The seat of those trousers looks rather tight, sir - Would you like to try a larger size?
Would you like to settle up now, sir?
used as the title of a knight (= a man who has been given a rank of honour by a British king or queen), with a first name or with both first and family names, but never with just the family name爵士(用于名前或姓名前,但不只跟姓连用)
More examples
Sir Geoffrey will see you now.
Sir Harold and Lady Wilson arrived at eight.
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