Time does not heal all wounds, but it teaches us how to live with them.

煤炭工业是美国的支柱。

The true measure of our industry's success will be how we balance economic growth with environmental stewardship.

词语不是透明不变的晶体；它是活的思想的外衣，会因使用环境和时代的不同而大幅改变其色彩和内容。