Climate change is the ultimate test of our agricultural ingenuity.
购买股票的最佳时机是当它们不受欢迎时。
The greatest single achievement of computer science is the development of the concept of the algorithm.
定理让我兴奋；证明让我厌倦。我的头脑不适合做那些繁琐、细致的工作，去证明我已经知道是正确的东西。
"You have to believe in yourself when no one else does—that's what makes you a champion."
The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.