I want to liberate America from fear. I want people to be afraid of the things that are really scary, like war and famine, not their neighbor because he has a different religion.

地球是一个动态的物体，其表面在不断变化。

【释义】：积累千万财富，不如掌握一门技艺。  

The history of life is written in mutations.

我们必须在能源安全需求和减排的迫切性之间取得平衡。

The best art education is teaching students how to see.

股票市场是一种将钱从急躁的人转移到耐心的人的工具。

农业真正的领导力意味着要超越当前的收获。