数学思想的真正考验是它能否激发进一步的思考。
The true test of a mathematical idea is its ability to inspire further thought.
可持续发展不是一种选择,而是现代经济中生存的必要条件。
Be thankful for what you have; you’ll end up having more. If you concentrate on what you don’t have, you will never, ever have enough.