过去是一个异国他乡；他们做事的方式不同。

我们不能改变过去，但我们可以改变对过去的看法。

When you are young spend at least 6 months to one year living as poor as you can， owning as little as you possibly can， eating beans and rice in a tiny room or tent， to experience what your “worst” lifestyle might be. That way any time you have to risk something in the future you won’t be afraid of the worst case scenario.

事实上，我不知道如果没有数学我会做什么。