N-VOC
先生(对男子的称呼，尤为儿语或用于称呼不知姓名的男子)
Men are sometimes addressed as mister, especially by children and especially when the person talking to them does not know their name.
例句
Look, Mister, we know our job, so don't try to tell us what to do.
嘿，先生，我们知道自己该干什么，不用你指挥。