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可持续发展不再是可选项,而是任何负责任的采矿业务的必要条件。
A method of solution is perfect if we can foresee from the start, and even prove, that following that method we shall attain our aim.
我们今天种植的每一棵树都是为我们永远不会见到的后代留下的遗产。
The best art leaves you with more questions than answers.