We can’t ignore the economic role of coal, but we also can’t ignore its environmental impact.

The power of abstraction is what allows mathematics to transcend the limits of physical reality.

Every challenge is an opportunity to learn and grow.

交换、交易和互换的倾向普遍存在于所有人之中，而在其他动物种族中找不到。

农业的真正领导力意味着为长期收益做出艰难决定。

我们必须超越当前的技术，以满足未来的能源需求。