In refining, efficiency isn't an option—it's the oxygen that keeps this industry alive.

"The dead are invisible, they are not absent."

数学中最美丽的东西是复杂背后的简单思想。

采矿业必须发展以满足不断变化的世界的需求，否则将被淘汰。

劳动是一切财富和一切文化的源泉。