By studying the transition between the panting of chimps and the human ha-ha, scientists discovered that breath control is the key to the emergence of both human laughter and speech.

通过研究从大猩猩喘气的呼呼声到人类“哈哈”的笑声两者之间的转化，科学家发现，呼吸控制是人类语音和笑声出现的关键所在。

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If there's a true rapport between two people, the smile will lead to laughter, and who amongst us doesn't feel a high when we meet someone who laughs at our jokes?

如果两人之间有融洽的默契，微笑就会变成开怀大笑，我们都感受过别人因为我们的笑话大笑时那种开心的心情。

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Next, children are the bonds between wives and husbands. It is hard to imagine what the family life might be without children's laughter.

其次，孩子是夫妻之间的纽带。很难想象，一个家庭中没有孩子的笑声，生活将变成什么样子。

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And I look forward to spending a lot of time with you guys -- (laughter) -- between now and the New Year.

WHITEHOUSE: President Obama Speaks on Confirming Richard Cordray

And the only thing that I'm not going to do, though, is get in the middle of an argument between Hawkeye and Huskers fans. (Laughter.) I'm not going to go there.

WHITEHOUSE: Remarks by the President at Campaign Event

Iowans, you guys pay attention -- (laughter and applause) -- the choice you make is not just between two candidates or parties.

WHITEHOUSE: The White House