改造过的细菌能分泌烷类，很容易被收集并可以用作燃料。

The bacteria secrete the alkanes, which can then by easily collected and used as a fuel.

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这种植物的毒性来自自然产生的莨菪烷类生物碱。

The toxicity of the plant is due to the naturally occurring tropane alkaloids.

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例如，大肠杆菌以其自身合成的一些脂肪酸为食，而不是以它们为原料来生产烷类。

For example, the E. coli naturally feeds on some of the fatty acids it produces, rather than using them as a feedstock for producing alkanes.

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