The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

Innovation in oil extraction must go hand in hand with environmental stewardship.

我总是很高兴地想到，我的教育大部分是非正式的，并且根植于土壤之中。

我们必须始终努力使技术对每个人都是可及的。