brown nose不是“棕色的鼻子”，真实含义是马屁精；拍马屁。

【例句】
The people who want to show off do, the brown-nosers brown nose, everyone else wastes their time.
那些马屁精喜欢开会，而其他人都是在浪费时间。

I've never known how to brown nose in others.
我从来都不知道如何去奉承人。