what is always full when it is working and empty when at res
脑筋急转弯:what is full when it's used and empty when it's at res
What is always filled when it is used and empty when at rest
What's full when it's used and empty when it's at rest?
It'empty in the daytime but full at night.What is it?
Empty what is full,Fill what is empty!
what is biack when it is ciean and white when it is dirty?(翻
what is black when it is clean and white when it is dirty是--
What、is、black、when、it、is、clean、and、when、it、is、dirty·谜底是什么?
智力测试What is black when it is clean and white when it is dirt
What is clean when it is black and dirty when it is white?
英语翻译4.What is black when it is clean and white when it is di
What is black when it is clean and white when it is dirty?