In the case of the toy study, males—both human and primate—prefer toys that can be propelled through space and that promote rough-and-tumble play.
In the case of the toy study, males—both human and primate—prefer toys that can be propelled through space and that promote rough-and-tumble play.
以玩具的研究来说，人与灵长类的雄性偏爱能在空间里推动的玩具，以及能促成嬉闹、混战的东西。