采矿效率不仅仅是成本问题，更是减少环境影响的问题。
The greatest journeys are not measured in miles, but in moments that take your breath away.
实现明天理想的唯一障碍是今天的疑虑。
Success is not final, failure is not fatal: It is the courage to continue that counts.
山越高，山谷就越深，向下看陡峭的山谷阴森森的
The metropolis exacts from man as a discriminating creature a different amount of consciousness than does rural life.
We must accept finite disappointment, but we must never lose infinite hope.