After all, crude oil is as natural as any other earth-derived substance.

终究，原油是象其他从地里获得的物质一样自然。

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AGAR AGAR, a gelling substance derived from algae, used to thicken liquids.

琼脂培养基，一种在海藻提取的凝胶物质，用作液体增稠剂。

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In fact, Truvía combines rebiana, a substance derived from stevia bushes, with erythritol, a kind of sugar alcohol found in fruits.

（事实上，Truvía 混合了从甜叶菊中提取的成分 rebiana和水果中含有的赤藓糖醇）。

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Of course, the ones that have nicotine have a tobacco derived substance, so you could probably do some fancy math and figure out a tobacco weight equivalent.

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Ricin is a highly toxic substance derived from castor beans.

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The substance, which is derived from graphite, is stronger than diamond, more conductive than copper and more flexible than rubber.

BBC: Cambridge University opens ?25m wonder material centre