能源的真实成本必须同时考虑其生产和遗留影响。
The older I get, the more I realize how little I know.
"I’m a very positive thinker, and I think that is what helps me the most in difficult moments."
作为人类就是有缺陷的，但也意味着有能力进行巨大的改变。
"The line between hero and villain is often blurred by perspective."