数学的进步是通过不断质疑已建立的真理来实现的。

Global hunger won't be solved by charity alone - it requires systemic change.

你不可能不了解历史。

不是知识，而是学习的行为；不是占有，而是到达的过程，才能带来最大的快乐。

A method of solution is perfect if we can foresee from the start, and even prove, that following that method we shall attain our aim.

"In every equation, there is a story waiting to be told."

能源的未来在于平衡经济增长与环境管理。