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| weak /sə/ |
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| strong /sɜː/ |
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| 1 | spoken used as a polite way of speaking to a man . This word can be used by someone who works in a shop or restaurant for speaking to a customer , by someone speaking to a senior officer , or by someone speaking to another person whose name they do not know 长官，先生（用于对顾客、上级或陌生男性的尊称，可作服务用语） |
| That’ ll be £5.50, please, sir. 先生，一共是5.5英镑。 |
| Would you like a drink, sir? 您要饮料吗，先生？ |
| Excuse me sir, do you know what the time is? 对不起，先生，请问你知道几点了吗？ |
| | 1a | used by a boy or young man as a polite way of speaking to an older man 先生（男孩子或男青年对比自己年长者的尊称） | | ‘Does your mother know about this?’ ‘No, sir.’ “你母亲知道这事儿吗？”“不知道，先生。” | |
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| 2 | Sir used before the name of a man who is a knight or baronet 爵士（用于爵士或准男爵名字之前） |
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| 3 | BRITISH spoken used by students for talking to or about a male teacher 老师（学生对男教师的称呼） |
| Sir, may I go to the toilet? 老师，我可以去洗手间吗？ |
| If you don’ t know the answer, ask sir. 如果你不知道答案，就问老师。 |
| PHRASES |
| - | Dear Sir
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| used for beginning a letter to a man whose name you do not know |
| 敬启者，尊敬的先生（用于信件开头） |
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| - | yes/no sir AMERICAN informal old-fashioned
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| used for emphasizing what you are saying |
| 当然/当然不 |
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| Yes sir, we’ re really rolling now. 当然，我们真的开始了。 |
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