The existence of a legal system is a matter of social fact.
Failure is the best teacher. You learn by making mistakes and figuring out how to correct them.
The task of psychology is to reduce complex mental phenomena to their simplest components.
从某种意义上说，共同基金行业是建立在巫术之上的。
粮食问题不仅是经济问题，更是政治问题，关系到国家的长治久安。
可持续发展不仅是一种趋势，更是我们对未来的责任。