Sun don't shine forever.

The only limits in life are the ones you set for yourself.

煤炭行业的遗产将由我们今天的行动决定。

一个奇怪的事实是，根据从生物学或地球物理学的角度出发，对地球史前条件会得出完全相反的结论，这反映了我们目前知识的不完整状态。

The great challenge of our time is to create a world order that is both just and sustainable.

The imagination imitates. It is the critical spirit that creates.

我们不是在观察心灵，而是心灵通过我们在观察世界。