It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.

自由是对自我设定法则的服从。

选自汉·桓宽《盐铁论·申韩》。从事治学的人，需要广泛的阅读，并且需要从中吸取正确、有用的内容。

科学家和渔民之间的合作是解决水产养殖挑战的关键。