过去从未死去。它甚至不是过去。
The past is never dead. It's not even past.
Innovation in technology can drive efficiency and reduce the environmental impact of mining operations.
The past is not dead; it is not even past.
Every drop of oil saved through innovation is a step toward a cleaner future.
数学的力量在于它的抽象性，使我们能够看到不立即显现的模式和联系。
我不数我的仰卧起坐。只有当它开始疼的时候，我才开始数。