The only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others.
二叠纪盆地将在未来几十年内保持美国石油生产的皇冠地位。
系统不是一个生产系统,而是一个消费系统。
绘画是一种在纸上思考的方式。