我们家有四口人。我有一个四岁的弟弟，他跟我一起玩。

There are four people in my family. I have a little brother who is four, and he plays with me.

youdao

我们家有四口人。我有一个四岁的弟弟，他跟我一起玩。

There are four people in my family. I have a little brother who is four, and he plays with me.

youdao