可持续发展不再是可选项；对于任何负责任的矿业公司来说都是必需品。
Sustainability isn't an option anymore; it's a necessity for any responsible mining company.
Sustainability must be profitable, or it won't be sustainable.
I think track records are very important. If you start trying to have a perfect one in a simple thing like honesty, you're well on your way to success in this world.
一个句子的意义不仅仅在于词语本身，还在于它所执行的言行行为。
The best ideas often come from challenging the status quo.
The labor which it would require to make a single one of these guns by hand would exhaust the patience and perseverance of any ordinary workman.
在数学中，你不理解事物。你只是习惯了它们。