The man in the planning room, whose specialty under scientific management is planning ahead, invariably finds that the work can be done better and more economically by a subdivision of the labor.

自然实验是理解现实世界中因果关系的强大工具。

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

法国是一个对未来充满信心但从不忘记历史的国家。

地理学是研究地球作为人类家园的科学。