我是世界上最智慧的人，因为我知道一件事，那就是我一无所知。
I am the wisest man alive, for I know one thing, and that is that I know nothing.
使变量可变很容易。控制恒定的持续时间是诀窍。
The secret of change is to focus all of your energy not on fighting the old, but on building the new.
能源的未来在于平衡经济增长与环境责任。
