短缺乃是一种符号，它意味着价格被人为地保持在低于供求双方可以自由行事时的水平。
A shortage is a sign that somebody is keeping the price artificially lower than it would be if supply and demand were allowed to operate freely.
The Langlands program is a reflection of the unity of mathematical thought.
生活就是不断地放下，但最遗憾的是我们来不及好好告别。
"Hope is the only thing stronger than fear."
道家的自然观不仅是一个物理概念，更是一个形而上的概念。