对于仅仅三个月大的孩子，它们已经可以辨别人的声音与其他声音-并且懂得什么时候你是伤心的。奇怪的是，快乐的声音它们并不会感觉到。

For at just three months old, babies can tell human voices from other sounds - and work out when someone is sad. Curiously, happy sounds just wash over them.

youdao

对于仅仅三个月大的孩子，它们已经可以辨别人的声音与其他声音-并且懂得什么时候你是伤心的。奇怪的是，快乐的声音它们并不会感觉到。

For at just three months old, babies can tell human voices from other sounds - and work out when someone is sad. Curiously, happy sounds just wash over them.

youdao