Adult humans laugh primarily on the exhale, but human babies laugh on the inhale and the exhale—as do chimps. Christopher Intagliata reports.

　　成年人主要通过呼气来产生笑，但是婴儿在吸气和呼气时都会产生笑 - 就像黑猩猩一样。 Christopher Intagliata报道。

　　A baby’s laugh is unmistakable: But aside from its squealing, high-pitched quality, there’s another factor that sets a baby’s laugh apart from ours: babies laugh on the exhale and on the inhale. Whereas adult humans "tend to laugh predominantly on the exhale. The classic kind of ’ha ha ha.’" Disa Sauter, a psychologist who studies emotions at the University of Amsterdam.

　　婴儿的笑是独具特色的：<片段：宝宝笑声>。除了声音尖细，音调高昂外，还有另一个让宝宝的笑声与成人笑声区别开来的特点是：婴儿在呼气和吸气时都可以笑。 而成年人“往往是在呼气时笑。例如典型的‘哈哈哈’。”Disa Sauter说到，他是一位在阿姆斯特丹大学研究情绪的心理学家。

　　Sauter and her colleagues collected 44 samples of babies laughing, from the ages of 3 months… to 10 months… all the way up to 18 months .

　　Sauter和她的同事收集了44个婴儿笑声的样本，例如3个月大的...... <片段：3个月> 10个月的...... <片段：10个月>一直到18个月<片段：18个月>。

　　They played the samples for about 100 untrained volunteers, and asked them to deconstruct the laughs. Were the babies laughing on the inhale, the exhale, or both? "And there we find a nice relationship between the age of the baby and the amount of the laughter happening on the inhale."

　　他们让100名未经训练的志愿者听婴儿的笑声片段，并要求他们分析笑声的结构—婴儿是在吸气时笑?呼气时笑?还是两者都笑? “后来，我们发现婴儿的年龄与吸气时发生的笑声的比例之间非常相关。”

　　The younger the baby, the more laughs on the inhale. Because remember, our laughs gravitate towards the exhale as we age. And Sauter thinks one reason for that could be that we gain more vocal control as we learn to talk: speaking also happens primarily on the exhale.

　　宝宝的年龄越小，他们就越喜欢在吸气时笑。 因为记住这一点：随着年龄的增长，我们的笑声会倾向于呼气。 而Sauter认为，其中一个原因可能是我们在学会说话时掌握了了更多的声音控制能力：说话也主要通过呼气进行。

　　She presented the preliminary findings at a meeting of the Acoustical Society of America, in Victoria, Canada. [Disa Sauter et al., How do babies laugh?] The researchers are in the process of checking the judgments of the volunteers against those of professional phoneticians.

　　她在加拿大维多利亚州举办的美国声学学会会议上介绍了初步研究发现。 [Disa Sauter等人，婴儿如何笑(How do babies laugh?)]研究人员正在将志愿者和专业语音人员对婴儿声音样本的判断结果比对验证。

　　As it happens: human babies aren’t the only primates who laugh both breathing our and breathing in. Chimps do it, too.

　　碰巧的是：人类婴儿不是唯一一种在呼气和吸气是都可以笑的灵长类动物。<片段：黑猩猩>黑猩猩也能这么做。

　　"They laugh like ’hoo hoo hoo.’ They laugh more continuously while inhaling and exhaling. It’s totally difficult to do on purpose."

　　“他们笑得像‘吼、吼、吼’。 他们在吸气和呼气时都可以不停地笑，有意识的这样做其实很难。“

　　But Sauter, I thought, pulled off a pretty good impression. "I’ll take that as a compliment! "

　　但是，我想，Sauter给人的印象非常好。 “我会把它作为一种恭维!”