sir

Excuse me, Sir, you accidentally dropped your leather wallet on the floor near the station entrance.

(Chinese) 打扰一下，先生，你不小心把皮夹掉在车站入口附近的地板上了。

The waiter addressed the elderly gentleman as "Sir" throughout the entire formal dining service.

(Chinese) 在整个正式用餐服务过程中，服务员一直称呼这位年长的绅士为“先生”。