what goes up and down the stairs without moving?

what goes up and never goes down? What always goes up and never goes down? What always goes up and never goes down?是什么意思? What always goes up and never goes down? What thing always goes up,and never comes down what goes up and down but doesn't move? 是什么意思? what goes up and down the stairs without moving? What is it that goes up and never goes down ?请帮忙猜一下那是什么? What goes up and never comes down?What goes up and never comes down?A Monkeys B House C Your age D Boys and girs 猜谜语：What is more useful after it is broken?还有一个：What goes up and never goes down? english puzzle1.what is the cheapest way to see the world?2.what goes up and never goes down? 美乐蒂幼儿英语律动 see -saw up and down,see saw and dow What goes up and never goes down?字谜1.The beginning of eternity ,The ehd of time and space.The beginning of every end,Ahd the end of every place.2.What goes up ahd never goes down?字谜 what is it that goes up and goes down but does not move?求大神级回答 句子 英语翻译then the skateboard went up and michael fell dow with a cry 英语翻译What always goes up and never goes down?What’s black when it's clean and white when it's dirty? What has roots as nobodysees,It is taller than tree Up ,up it goes,And yet never grows?Itis( ) what comes down but never goes up-