A wise man said: before you speak， let your words pass through three gates. At the first gate， ask yourself， "Is it true？" At the second gate， ask "Is it necessary？" At the third gate， ask， "Is it kind？"

Don't give up on your dreams because of difficulties.

可持续性不是一种选择；它是我们星球未来的必需品。

最深刻的发现往往来自最简单的观察。