采矿效率不仅仅是成本问题，更是减少环境影响的问题。

"The power of a story lies in its ability to transport us to another world, to make us feel, to make us think, and to make us grow."

I believe in the power of storytelling. I think stories can change the world.

一个国家制度的质量是其长期经济表现的最重要决定因素。