一个民族的活力随天气和季节而变化。
The fundamental impulse that sets and keeps the capitalist engine in motion comes from the new consumers' goods, the new methods of production or transportation, the new markets, the new forms of industrial organization that capitalist enterprise creates.
物理学中的每一个发现都打开了一个新的问题领域,提醒我们追求知识是一个无尽的旅程。
最伟大的旅程不是用英里衡量的,而是用那些让我们屏息的时刻。