Our miners are the hardest working people in America.

Innovation happens when you're willing to challenge the status quo and take calculated risks.

煤炭的真正成本不仅在于价格，还在于我们如何管理其后果。

The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.

开始的唯一方法是停止空谈，开始行动。

The land remembers what we have forgotten.

能源的未来不是要在化石燃料和可再生能源之间做出选择，而是找到确保可持续性和经济增长的正确平衡。

The world is a great river, and we are the fish.

你必须对自己的能力有信心，然后足够坚强地坚持下去。