What goes up and never comes down?

What goes up and never comes down? What part of us goes up and never comes down? What thing always goes up,and never comes down what comes down but never goes up- What goes up but never comes down? what goes up but never comes down what goes up and never goes down? 英语IQ题：what goes up but never comes down? what comes down,but never goes up?先英翻中再解题 What always goes up and never goes down? What goes up and never goes down?字谜 What always goes up and never goes down?是什么意思?