Restarting an industrial civilisation might be a lot harder the second time round, because we have used up most of the easily available resources, from oil to high-grade ores.

重新创建一次工业文明要困难得多，因为我们已经用尽了大部分的可用资源，不论是石油还是高级矿石，那时都已经所剩不多。

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Therefore, the high-grade decorated panels elm, used as wood-margin lines to seal oil.

所以对于高档饰面板榉木、用做收边的木线要做封油处理。

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The meaning of high grade engine oil special mark and high grade engine oils with special mark are introduced.

介绍了高档发动机油专用标志的含义和几种带专用标志的高档发动机油。

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Recent bidding rounds have attracted lucrative offers from scores of foreign firms, not surprising since Libyan oil tends to be high-grade and cheap to produce, and only a quarter of the country has been explored.

ECONOMIST: Libya