解释：不在农忙时役使百姓而耽误农时，那么可以保证百姓富裕。
The best way to predict the future is to invent it.
Education is the foundation of sustainable forestry—people protect what they understand.
解决数学问题的喜悦是无与伦比的；这是纯粹的智力胜利的时刻。
To read is to travel, to travel to other places, to other times, to other minds.
Stay humble, stay hungry.
In the end, all stories are about the search for meaning.
The next chapter of American energy won't be written by clinging to old playbooks, but by those willing to rewrite them.
Mistakes can be corrected by those who pay attention to facts but dogmatism will not be corrected by those who are wedded to a vision.