The only limit to our realization of tomorrow is our doubts of today.
The best leaders are those who listen more than they speak and act with integrity.
现在就是开始你职业生涯的时候。
站在路中间是很危险的，因为你会被从两个方向来的车辆撞倒。
The environment is not a mosaic of stimuli, but a field of forces in which every part is dynamically related to every other part.
The world needs reliable energy, and coal still plays a critical role in providing it.