质量从来不是偶然的，它始终是智慧努力的结果。
Quality is never an accident; it is always the result of intelligent effort.
你不可能爱所有人，但你可以对所有人友善。
We must balance the need for energy with the responsibility to protect our planet.
每个数学问题都有解答；挑战在于找到它。
We kid ourselves if we think that the ratio of procedure to data in an active data-base system can be made arbitrarily small or even kept small.