安全困境是国际政治的一个基本特征，因为国家增加自身安全的努力往往会降低其他国家的安全。
The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.
Innovation is the only way to break through resource constraints.
The only thing worse than training employees and losing them is not training them and keeping them.
Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.
I'm not a rapper, I'm a Hall of Famer.
I ask senior leaders to not do anything unless they're willing to do it for 10 years.
中国的崛起代表了自成立以来对自由国际秩序的最重大挑战。
"A good book is the best of friends, the same today and forever."