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.
I think it's important to take risks and to challenge yourself. That's how you grow as an artist and as a person.
Persistence is the key to unlocking the mysteries of medicine.
成功不是偶然的,它是选择、坚持、学习、牺牲,以及最重要的,对所做之事的热爱。