任何圆的面积等于一个直角三角形，其中一条直角边等于半径，另一条等于圆的周长。
I don't care about being remembered, I care about what I'm doing right now.
乐观不仅仅是一种特质；它是一种可以培养的技能。
We're told, from many sources, that any onecan achieve anything. We've done away with the caste system, we are now in a system where anyone can rise to any position they please. And it's a beautiful idea. Along with that is a kind of spirit of equality; we're all basically equal. There are no strictly defined hierarchies. There is one really big problem with this, and that problem is envy.
Sustainability is not just about planting trees; it's about ensuring that every action we take today doesn't compromise the future.