可持续性不是一个流行词，而是长期成功的商业必要条件。

He who knows only his side of the case knows little of that.

The future of coal lies in balancing environmental responsibility with energy demands.

一个人的价值或价值，就像所有其他事物一样，是他的价格；也就是说，为了使用他的力量而愿意付出的代价。