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.
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。
La literatura no es otra cosa que un sueño dirigido.
数学的美在于它既精确又富有创造性。