The challenge of modern physics is not just to find answers but to ask the right questions.
金钱是非常不可思议的东西。它和爱一样,是人类喜悦的最大来源。但是它也和死一样,是人类忧烦的最大来源。
老百姓可以长久没有财物,但不能一天没有饭吃。
农业实践中的微小改变可以对全球粮食安全产生重大影响。
The child is not a passive recipient of knowledge but an active participant in the learning process.