What always goes up and never goes down?是什么意思?

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 never goes down? 猜谜语 what man cannot live in a house?what always猜谜语 what man cannot live in a house?what always goes up and never goes down?a mouse has large pocket.What is it? 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? 智力测试：1.what always goes up and never goes down 2.Why did the boy make his dog sit in the sun what comes down but never goes up- what goes up but never comes down what goes up when rain comes down what goes up must come down What goes up,must come down Which thing always goes up,and never comes down?是什么? what goes up but never comes up猜一猜 英语智力测验1.What always goes up and never goes down?____________________________________2.why did the boy make his dog sit in the sun?_______________________________________3.what is the smallest bridge in the world?__________________________ 1.If your uncle's sister is not your aunt,who is she?2.What always goes up and never goes down?3.What letter should appear next?Y-W-T-P-? 1.when can you get water with a net?2.what aiways goes up and never goes down?第二题中有一个单词拼写错了,1.when can you get water with a net?2.what always goes up and never goes down?请把问题翻译成汉语,然后给出答案,