Sustainability in mining is not an option—it's a necessity for our future.
The most elegant theories are useless if they don't correspond to reality.
译文:我衰老得太厉害了!感慨平生交游的朋友渐渐零落,如今还剩下几个?白发空自垂下三千丈,对人间万事只能付之一笑。试问什么事物能让我真正欢喜?