To feed the world, we must first learn to respect the limits of our planet.

The world always seems brighter when you've just made something that wasn't there before.

    ——杜先生晚年在香港，先生为中国抗战.赈灾慈善做出巨大贡献，晚年依旧气度过人，毁掉所有欠条。

"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

保护我远离我想要的。

词语不是透明不变的晶体；它是活的思想的外衣，会因使用环境和时代的不同而大幅改变其色彩和内容。