不能以牺牲他人自由为代价来获得持久和平。
The key to success in mining is sustainability—balancing economic growth with environmental responsibility.
The quest for a unified theory of physics is one of the greatest intellectual adventures of our time.
知识在心灵中以符号结构的形式表征。
幸福不是拥有你想要的，而是想要你拥有的。