时间是一个从我们感知变化的方式中衍生出来的概念。
I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.
爱的意义是爱那些不可爱的;宽恕的意义是宽恕那些不可宽恕的;信仰的意义是信仰那些不可置信的;希望的意义是当一切看上去毫无希望的时候仍心有希望。