煤炭的真实成本必须既考虑其即时价值，也考虑其对社区和生态系统的长期影响。
A mind needs books like as word needs a whetstone.
Sustainability is not just a buzzword, it's our responsibility.
The last of human freedoms is the ability to choose one's attitude in any given set of circumstances.
城市是记忆的迷宫，每条街道都是时间网中的一根线。