本文和大家分享的口语表达是：keep one's nose clean。这个口语表达可不是“把鼻子擦干净”的意思，而是“远离是非，少惹麻烦，安分守己”的意思。相当于：keep out of trouble, avoid getting into trouble。
- They are in hot water now, so they are trying to keep their noses clean.
- Stay away from that person. He's a bad egg. You'd better keep your nose clean. I mean it.
- Students have to keep their noses clean or they might be kicked out of school.
- If you don't learn how to keep your nose clean, you're going to end up in jail.
- You can get promoted as long as you keep your nose clean.