The future of life on Earth depends on our ability to take action. Many individuals are doing what they can, but real success can only come if there is a change in our societies and our economics and in our politics.
理解计算的极限与理解数学的极限同样重要。
系统生产需求的速度比满足需求的速度更快，因此它自我延续。
She walks in beauty, like the night
我想被人们记住是一个好人