He discovers knock-knock jokes and learns how to add, subtract, and read.

他能听懂笑话了，学会了怎么去算加减法，还有怎样去阅读。

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When asked by the hiring manager if he had any questions, the candidate replied by telling a knock-knock joke.

招聘经理问求职者有什么问题，他竟然用一个‘冷笑话’来回答。

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When turning personal situations into comedic material, remember lessons learned from a childhood humor staple: Knock-Knock Jokes.

当你将个人经历当成喜剧素材来讲时，记住我们从孩童时期的幽默游戏中学到的：敲门游戏。

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And woops-- I knock over the tower.

可是我居然打翻了这座积木塔。

耶鲁公开课 - 死亡课程节选

But there it was, again and again the banana slicer had become a Facebook version of that old knock-knock joke your weird uncle has been telling for years.

NPR: As Facebook Matures, Is It Losing Its Edge?

Second, biologics are really difficult to copy, and thus even after the patents expire, knock-off biologics (biosimilars) are far less a threat than knock-off small molecules (generics).

FORBES: Strategy: Why Big Pharmas Do What They Do -- And How Silicon Valley Might Help Them Think Differently

Knock it - or be seen to knock it - at your peril.

BBC: What you think of reshaping the NHS