孔子说:“将知识默记在心,学习时,不感到满足;教人时,不感到疲倦,对我来说没什么问题。”
Technological innovation in mining isn't about replacing people, but about making their jobs safer and more productive.
科学的进步不是一条直线,而是一个螺旋,总是在前进,又总是回到起点。