Efficiency in extraction isn't just good for profits; it's good for the planet.
开采效率不仅对利润有好处,对地球也有好处。
文明被描述为人类与其环境相互作用的结果。
You cannot teach a man anything, you can only help him to find it for himself.
第一代杂种的同一性,第二代的不相似性,是精确观察者无法忽视的事实。