translation.en: As babies engage with caregivers, they soon realize that, well, there is something in between the ears that is very important -- it's invisible, you can't see -- but is really critical, and that thing is called attention.
translation.zh: 当婴儿和照顾者在一起时, 他们很快便意识到 在两个人的耳朵之间 存在着很重要的东西 这种东西是无形的,你看不见, 但却非常重要 这种东西就是所谓的注意力