科学家通过“挠痒痒”这种方式来使不同种类的大猩猩和一些人类婴儿发出笑声。

That's how researchers made a variety of apes and some human babies laugh.

youdao

科学家通过“挠痒痒”这种方式来使不同种类的大猩猩和一些人类婴儿发出笑声。

That's how researchers made a variety of apes and some human babies laugh.

youdao