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。

youdao

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。

youdao

It's time for an a Moment of science science joke, where we tell you a knee-slapper, and then ruin the fun by explaining it. Ready?

现在是《科学一刻》节目的科学笑话时候，我们会告诉你一个笑话，然后通过解释这个笑话让你感觉其实这并不是一个笑话。准备好了吗？

youdao

His book's title, What Can Chief Executives Learn From Stand-Up Comedians? is not exactly a thigh-slapper.

FORBES: Leadership

Not a schmoozer, not a back-slapper but focused on execution, details, and getting deals done.

NPR: Who Is Henry Paulson?

Mr. GATES (as the Slapper): There was a time when I could have had you shot.

NPR: 'Crash' Expands Cinema's Exploration of Race