The future of coal depends on balancing economic growth with environmental care.
In the end, that's what this election is about. Do we participate in a politics of cynicism or a politics of hope?
复杂性不是理解的障碍，而是需要克服的挑战。
数学的进步是通过概括实现的。
The key to happiness is to have dreams. The key to success is to make your dreams come true.
I try to dedicate as much time as possible to my family and kids, but I also have to be selfish in terms of my career and my goals.