【what is clean when it black ,and white when it is dirty.
问题描述:
【what is clean when it black ,and white when it is dirty.
答
什么东西在黑的时候是干净的,白的时候却脏了呢?
【what is clean when it black ,and white when it is dirty.
什么东西在黑的时候是干净的,白的时候却脏了呢?