Sir
01
先生, 阁下
used as a respectful or polite way of referring to or addressing a man
例子
The receptionist asked, " How may I assist you, sir? "
接待员问道：“先生，我如何能帮助您？”
He addressed the guest speaker as sir during the interview.
在采访中，他称呼客座演讲者为先生。
02
先生, 爵士
a title used before the name of knight or baronet
