钢是铁与碳的合金，焦煤便是熔炼过程中碳的来源。

Steel is an alloy of iron and carbon. Coking coal is a source of carbon in the smelting process.

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由于种种原因，在古新世-始新世极热时期地球大气中碳上升的量。

During the PETM, for reasons that are still unknown, the amount of carbon in Earth's atmosphere rose rapidly.

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储存在森林生物量、枯木、垃圾和土壤中的碳量共大约相当大气中碳量的50%。

Carbon stored in forest biomass, deadwood, litter and soil together is roughly 50 percent more than the amount of carbon in the atmosphere.

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Fat has twice the calories per unit weight that protein or carbohydrate sugar has, as a consequence, has the greatest survival value.

单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍,因此,脂肪才是最能维持生存的物质

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But you do, in fact, have to worry about long-term exposure, cyanide poisoning in terms of long-term effects in certain populations that do get the bulk of their carbohydrates from this root, from the root of the Cassava plant.

但是你确实，不得不担心长时间的接触，氰化物的慢性中毒会对,从木薯根中获取大部分,碳水化合物的部分人群产生影响。

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As I mentioned before, fat has twice the calories per unit weight as protein and carbohydrate.

如我之前所说,单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选