Peter: Mom, my nose is bleeding.
Mom: What happened, peter? Did you have a fight?
Peter: No, mom. I didn’t.
Mom: Did somebody hit you? Or did you just fall?
Peter: Mom~ I was just picking my nose, and now it’s bleeding.

Bleed 流血
Happen 发生
Fight 打架
Hit 打，打击
Fall 落下，跌倒
Pick nose 挖鼻子