经济发展理论研究的是经济系统如何产生不断改变它的力量。
The theory of economic development is the study of how the economic system generates the forces which incessantly transform it.
相信自己和你所拥有的一切。知道你内心有一种力量，比任何障碍都更强大。
To feed the world, we must first understand it.
The best decisions are those that benefit both people and the planet.
