The conjectures of the Langlands program are a challenge to the next generation of mathematicians.
Investing in cleaner coal technology is an investment in the future of energy.
人類智力的發(fā)展都應(yīng)該主要?dú)w功于欲望，而欲望能否被普遍滿足要依靠智力的發(fā)展。
"The novel is a form of exploration, a way of asking questions that don't have answers."