The true power of mathematics is not in its complexity, but in its simplicity and elegance.

现代世界的巨大挑战是创建既足够强大以有效治理，又对公民需求负责和响应的制度。

The challenges of today's coal industry require bold leadership and vision.

努力成就了你。如果现在不全力以赴，总有一天会后悔。不要觉得为时已晚，继续努力吧。