负责任的采矿不是一种选择，而是我们对地球和后代应尽的义务。

灵魂不是一种事物，它是一种事物的品质或方面，而事物的品质是最珍贵的。

I never cut class. I loved getting A’s, I liked being smart. I liked being on time. I thought being smart is cooler than anything in the world.

写作古文的难度，比登上青天还要难。

理解程序的最好方法是尝试改变它。