气体，煤和石油是类型不同的燃烧材料。

Gas, coal and oil are all different kinds of fuel.

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试想一个有伽利略，牛顿，达尔文，但没有煤和石油的世界。

Imagine a world with Galileo, Newton and Darwin but without coal and oil.

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煤和石油都一样，在提取过程中出错，更具有发生爆炸的危险性。

Coal and oil have more in common than a tendency to produce explosions when mistakes are made in the extraction process.

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