Every mathematical problem has a solution; it just takes time and effort to find it.

宇宙包含过去，现在与未来。

Forestry isn't extraction—it's cultivation on nature's timescale.

The poor don’t need handouts; they need ladders.

The spread of liberal democracy and the integration of the world economy have created a situation in which the major powers are no longer willing to go to war with one another.

The most valuable resource in our industry isn't underground—it's the people who make it all possible.

The world is not something to be understood, but something to be experienced.

煤炭造就了现代世界，我们有责任确保以智慧管理它的遗产。