发现的喜悦是科学家们前进的动力。

The writer must believe that what he is doing is the most important thing in the world. And he must hold to this illusion even when he knows it is not true.

解释：大旱之年收购船只，大水之年抛售船只并收购车辆，待到大旱之年再抛售车辆。

市场总是处于不确定和变化的状态，赚钱是通过对显而易见的事情进行折现并对意外事件下注。