当婴儿笑时，我们知道他们很快乐；当他们哭时，我们知道他们病了或只是想要什么东西。

When babies laugh, we know they are happy, and whey they cry, we know they are ill of simply want something.

youdao

当婴儿笑时，我们知道他们很快乐；当他们哭时，我们知道他们病了或只是想要什么东西。

When babies laugh, we know they are happy, and whey they cry, we know they are ill of simply want something.

youdao