The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.
农民是我们经济中唯一以零售价购买一切，以批发价出售一切，并支付双向运费的人。
The battle to feed all of humanity is over. The battle to feed all of humanity in the future has just begun.
友谊是时间投资的问题。
物理学的目的不是描述自然，而是理解自然。