Efficiency in mining comes from continuous improvement, not just big breakthroughs.
The best hedge against low oil prices is low breakeven costs.
文字的力量在于它们可以创造出从未存在过的世界。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
过去是一个异国;他们在那里做事的方式不同。