史蒂文：我们这些年也在减少有害气体排放量，但是汽车废气排放依然是空气污染的主要原因。
Steven: We have reduced emission of air pollutants in recent years, but cars are still a major source of them.
低污染：史特林引擎之燃烧供热过程通常为在一大气压之下长时间的燃烧过程，故燃烧较为完全且废气中CO含量很少。
Pollution: Stirling engine combustion heating process under atmospheric pressure is usually a long time in the combustion process, it burns more completely and co emissions in small amounts.
低污染：史特林引擎之燃烧供热过程通常为在一大气压之下长时间的燃烧过程，故燃烧较为完全且废气中CO含量很少。
Pollution: Stirling engine combustion heating process under atmospheric pressure is usually a long time in the combustion process, it burns more completely and co emissions in small amounts.
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