oxytocin plays a similar role in the bond between dogs and their owners.后叶催产素在狗与主人之间起了同样的作用

play a role in:在 ... 中起作用； 扮演角色

He was invited to play a role in this TV play.

他被邀请在这个电视剧里扮演一个角色。

The director played a role in writing the contract.

这长官在撰写合同中扮演了一个角色。

who are used to animals and used to interaction with animals,那些习惯与动物相处的人

interact with:与 ... 相互作用

How does he interact with his kids?

他和孩子如何交流呢?

The two chemicals interact with each other.

这两种化学物品相互作用。