The future of coal is not about the past; it's about innovation and sustainability.
我们唯一能希望获得的智慧是谦卑的智慧：谦卑是无止境的。
"The greatest stories are those that leave wounds."
"Every word we write is a step towards understanding ourselves and the world around us."
At the close of our studies， we knew all the past of physics， but nothing of the present and the future.
For every dollar you spend purchasing something substantial， expect to pay a dollar in repairs， maintenance， or disposal by the end of its life.