The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.

我不是说唱歌手，我是一个活着的传奇。

每一个反应都是原子之间的对话。

科学的精神在于不断质疑和探索，它让我们永远保持对世界的好奇心。