Gustison and her colleagues tested out that rule of human language on the calls of geladas—relatives of baboons.

古斯特森和她的同事在人类的亲戚狒狒身上检测人类语言的这种规则。

They like to test the rules; also, they're rebellious.

他们喜欢测试规则； 而且，他们很叛逆。