检验一个经济学家是否优秀的标准，是看他能否比别人更好地解释过去。
Never stop learning; the world is constantly evolving, and so should we.
One must not cheat anyone, not even the world of its triumph.
OPEC no longer holds all the cards in global oil markets.
跨行业合作是解决能源生产复杂挑战的关键。