"What do you drop when you need it and?take?back?when?you don't?"的中文意思和答案是啥?

问题描述:

"What do you drop when you need it and?take?back?when?you don't?"的中文意思和答案是啥?

什么东西在你需要的时候扔下去,不用的时候却收回来?
is The answer is anchor锚