农业的真正进步不仅以产量衡量成功,还要看生态系统健康。
In mathematics, the art of proposing a question must be held of higher value than solving it.
如果你是战士,别为你自己的自由而战,而要为你战友的自由而战。这样,战争对你俩来说,就会更加鼓舞人心。