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The existence of the natural world is the same kind of fact as the existence of any proposition.
Power resides where men believe it resides. It's a trick, a shadow on the wall. 
社会学的功能,如同每一门科学一样,是揭示隐藏的事物。
译文 :做学问的人,只要事事留心认真、一丝不苟,德行、学业的进步就会像涓涓流水一样不会终止。
可持续的基础设施应该平衡经济、社会和环境的效益。
Loneliness is the starting point of thought.
User needs are the driving force behind our progress.