优化是在给定约束条件下做出最佳决策的艺术。

If you're lonely when you're alone，you're in bad pany。

I'm not a trend, I'm an icon.

I'm the reason your hate won't die.

The mining industry has a responsibility to leave communities better than we found them.

我们必须投资于研究和教育，以确保下一代有能力引领行业向前发展。