Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.
数学不是沿着一条清理得很好的高速公路小心行进，而是一次进入陌生荒野的旅程，探险者常常会迷路。
The earth gives us coal; our duty is to give back stewardship.
The interplay between chemistry and biology is what makes life so fascinating.
The future of the world lies in the cities of the Third World.
可持续发展不是选择，而是对后代的责任。
历史不仅仅是已经发生的事情，也是可能发生的事情。