what alway goes up,but never come down?

what alway goes up,but never come down? what comes down but never goes up- What goes up but never comes down? what goes up but never comes 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 goes up but doesn't come down? what goes up and never goes down? what goes up but never comes up What goes up and never comes down? What goes up,must come down what goes up must come down