【英语时差8,16】猴妈妈的爱（下）

 The researchers observed macaque moms gently bouncing their young, holding their heads and trying to attract their gaze. And when the monkey moms made lip smacks¹, their babies often responded in kind. OK. But besides being adorable, so what? Well, for one thing, it suggests that this sort of mother-baby bonding is nothing new. In fact, it appears to go back tens of millions of years. Knowing this will help scientists better understand the origins of interpersonal communication. And knowing more about the origins may lead to greater understanding of the role that communication plays in infant development.

1 smacks   

掌掴（声）( smack的名词复数 )； 海洛因； （打的）一拳； 打巴掌

参考例句：

• His politeness smacks of condescension. 他的客气带有屈尊俯就的意味。
• It was a fishing town, and the sea was dotted with smacks. 这是个渔业城镇，海面上可看到渔帆点点。