This is called premastication food transfer and is a known behaviour in our great ape relatives.

这被称为预咀嚼食物转移，在人类的近亲类人猿身上也观察到过这一行为。

This is called premastication food transfer and is a known behaviour in our great ape relatives. Thankfully we now have baby food.

这称为咀嚼前食物转移， 是我们类人猿亲属的一种已知行为。谢天谢地，我们现在有婴儿食品了。

There is also a suggestion that mothers and their children bond over lip-on-lip kissing because of something called " premastication food transfer" .

还有一种说法是， 由于所谓的“咀嚼前食物转移” ，母亲和她们的孩子通过唇对唇接吻建立了联系。