The great wars of history—we have had a glimpse of this truth already—are the outcome, direct or indirect, of the unequal growth of nations.
历史上的大规模战争——我们已经瞥见了这一真相——直接或间接地源于国家间的不平衡发展。
The challenge of climate change requires collaboration between governments, businesses, and civil society.
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.