全球性挑战需要全球合作。

The very least you can do in your life is to figure out what you hope for. And the most you can do is live inside that hope. Not admire it from a distance but live right in it, under its roof.

我不想成为电影明星。我想成为一名演员。

在数学中，真理总是相对于你所在的系统而言的。