n. term of address for a man
n. a title used before the name of knight or baronet
n. 先生, 阁下
1. Could you help me, sir?
您能帮我吗，先生？
2. The waiter asked, "What would you like, sir?"
服务员问：“您想要什么，先生？”
3. Yes, sir, I will complete the task by tomorrow.
是的，先生，我会在明天之前完成这个任务。