Teacher: Kevin, why are you late this time?

Kevin: Please sir, I bruised（擦伤） two fingers knocking in a nail at home.

Teacher: I don't see any bandages.

Kevin: Oh, they weren't my fingers! I told my little sister to hold the nail.

老师：凯温，这次你怎么又迟到了?

凯温：对不起，老师，我在家钉钉子，砸坏了两个手指头。

老师：怎么没有扎绷带呀?

凯温：噢，砸的不是我的手指头，我叫小妹妹扶着钉子的。