Coal is an important energy in China, coal combustion is the primary source of pollutions which cause great destructions to the ecological environment.

煤在我国是一种重要的能源，煤的燃烧是造成我国生态环境破坏的最大污染源。

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Since oxygen is nonflammable but supports combustion, fire-fighting actions require shutting off the source of oxygen, if possible, then fighting the fire according to the material involved.

由于氧本身不可燃但支持燃烧，救火行动要求尽可能切断氧源，然后按照燃烧的材料来救火。

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Drag onto the page, then right - click to specify radioisotope or combustion heat source.

拖到绘图页上，然后右击可指定放射性同位素或燃烧热源。

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Petroleum caught on early as the main fuel source for internal combustion engines because it was plentiful and cheap to refine.

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On the other hand, this conflation makes far more sense in the long term, as our electrical grid becomes more sophisticated, and as electric vehicles begin the inevitable switch from internal combustion engines to electric motors or some other renewable source of power.

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