The aim of psychology is to describe the structure of experience.
To be a writer is to be a spy on life.
粮食安全是一个需要地方行动的全球性问题。
“需要”不认识任何的“法律”。
He who can, does. He who cannot, teaches.
大萧条是二十世纪的决定性宏观经济事件,它引发了对宏观经济理论和政策的根本性重新思考。