可持续性必须成为我们在采矿行业所做每个决策的核心。
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
在计算复杂性中,我们不仅仅是在处理我们能计算的极限,也是在处理我们能证明的极限。