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. 先生(对男子的称呼，尤为儿语或用于称呼不知姓名的男子) [informal]
Look, Mister, we know our job, so don't try to tell us what to do.