是先生的意思。

例如

Please, mister, can we have our ball back?求求你,先生,能把球还给我们吗

Look, Mister, we know our job, so don't try to tell us what to do.哎,先生,我们了解自己的工作,所以你不必告诉我们该干什么。

Mister, it was a night about as cold as tonight.先生,那是一个和今晚一样冷的夜晚。