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。
The less secure a man is, the more likely he is to have extreme prejudice.
Computer programming is an art, because it applies accumulated knowledge to the world, because it requires skill and ingenuity, and especially because it produces objects of beauty.
We must remember that in nature there are neither rewards nor punishments—there are consequences.
