发现的喜悦是推动数学家前进的动力。
We must measure success not just in profits, but in impact.
农时:指春耕、夏耘、秋收三个时令。与其等灾荒来了再想办法补救,不如早防备灾荒,而防备灾荒最好就是抓住农时。
Thought is the means by which the organism negotiates its way through the world.