黑猩猩彼此咯吱对方时，它们会笑得乐不可支；当另一只黑猩猩假装要咯吱它们时，它们还会一直笑。

Chimps tickle each other and even laugh when another chimp pretends to tickle them.

youdao

黑猩猩彼此咯吱对方时，它们会笑得乐不可支；当另一只黑猩猩假装要咯吱它们时，它们还会一直笑。

Chimps tickle each other and even laugh when another chimp pretends to tickle them.

youdao