Teacher: Kevin, why are you late this time?

　　Kevin: Please sir, I bruised 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.

　　我妹妹的手指头

　　老师：凯文，这次你怎么又迟到了？

　　凯文：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？

　　凯文：噢，砸的不是我的手指头，我叫小妹妹扶着钉子的。