The past is never truly past until it has been fully understood.
数学的美在于它既精确又富有创造性。
The only thing we have to fear is fear itself.
Sustainability is not a choice, it's a necessity.
唯一真正的错误是我们从中什么也没学到的错误。
The most widespread form of inequality in the world today is not that between rich and poor, but that between men and women.