1、We always pick up sth and throw away sth on our way. We couldn't realise what we pick up and throw away is just the same thing until we meet the end of the time, that is memory.(行路过程中总会有不断地捡到和丢掉一些东西。只有走到时间尽头时，才会发现，原来我们所捡的与所丢掉的都是同一样的东西，那就是记忆。)
pick sth up