Innovation in coal mining isn't about reinventing the wheel, but about making the wheel more efficient and environmentally friendly.
"Nur wer die Gefahr besteht, geht in sich."
译文:古代的士、农、工、商四种职业不同但遵循的道是相同的,他们尽自己的心力,在这一点上是一样的。
Everyone is a genius. But if you judge a fish by its ability to climb a tree, it will spend its whole life believing it is stupid.