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煤炭工業是美國的支柱。

My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

跨行業合作是解決世界最大挑戰的關鍵。

There are things that happen and leave no discernible trace, are not spoken or written of, though it would be very wrong to say that subsequent events go on indifferently, all the same, as though such things had never been.