数学不是一项观赏性运动；要理解它，必须积极参与其中。
我这一代人最伟大的发现是，人类可以通过改变心态来改变他们的生活。
比起知识本身，我对能用知识做什么更感兴趣。
The energy transition must be just - we owe that to the communities that have powered our nation for generations.
The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.
When we invest in sustainable farming, we're investing in the health of our planet and its people.