The product of combustion is water, is the world's most clean energy.
燃烧的产物是水，是世界上最干净的能源。
The reason is that the main product of combustion, zinc sulphide, is not present in the list of reaction species.
原因是主要产品的燃烧，硫化锌，是不在场，在清单中的反应物种。
Soot is usually the product of the imperfect combustion of fuel.
煤烟通常是燃料不完全燃烧的产物。
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