The past is never dead. It's not even past.

Every experiment, whether successful or not, is a step toward understanding.

Take time every day to do something for yourself.

释义：通过分析物品的过剩与短缺，就能判断其价值的高低。这句话揭示了市场供求关系对价格的影响。

肉类行业必须发展以满足下一代的需求。