1. He talked for 10 minutes and told only one knee-slapper during all that time.
他讲了10分钟,笑点只有一处。
www.chinadaily.com.cn
2. Undead Female - " I heard a knee slapper once , and skipped my kneecap right across a lake. ""
我听到我的膝盖响了一下, 然后膝盖骨就掉到湖里去了。
www.youdict.com
3. No group of thick Premiership footballers, roasting some poor little slapper in their post-match hotel room, could explain their behaviour with such devastating psychological honesty.