The true cost of coal must account for both its immediate value and its long-term impact on communities and ecosystems.

计算机科学家最重要的技能是解决问题。能够提出问题，创造性地思考解决方案，并清晰准确地表达解决方案。

You don't have to be a rock star to want to change the world.

一切幸福都绝非没有忧虑和烦恼，而一切逆境也绝非没有慰籍与希望。

迄今为止发现的让许多人自愿合作的唯一方式是通过自由市场。