To do things with words is not a special kind of doing, but a special kind of speaking.
经济学的力量在于它能够揭示关于世界如何运转的隐藏真相。
True sustainability means leaving the land better than we found it for future generations.
经济景观是一个由不同等级的中心地组成的系统,每个中心地为特定区域服务。
The most important property of a program is whether it accomplishes the intention of its user.