All human knowledge is from experience.

实现明天的唯一限制将是我们今天的疑虑。

You have to believe in yourself when no one else does.

煤炭曾是工业进步的支柱，但其未来必须平衡经济需求与环境责任。

We don't inherit the land from our ancestors; we borrow it from our children.

The future belongs to those who fight for it.

The young do not know enough to be prudent, and therefore they attempt the impossible – and achieve it, generation after generation.