Our sweetest songs are those that tell of saddest thought.
可持续性不是一种选择；它是能源未来的必要条件。
If you are insecure, guess what? The rest of the world is, too. Do not overestimate the competition and underestimate yourself. You are better than you think.
The historical sense involves a perception, not only of the pastness of the past, but of its presence.