它们具有的另一个优势在于，它们中有些是纯粹的碳氢化合物，类似与汽油。
They have the additional advantage that some are pure hydrocarbons, like petrol.
因此，化油器或者其他的类似装置必须精确地按照比例将汽油与空气进行混合，使得汽油充分燃烧。
Therefore, the carburetor or another metering device must combine the gasoline properly with the correct amount of air in order for the combustion process to release the energy in the gasoline.
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