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(b) 易燃燃料的不完全燃烧造成排放出大量一氧化碳、氮气、硫的氧化物、可致癌的多环碳氢气和煤烟;
(b) incomplete combustion of inflammable fuel has caused the emission of a huge quantity of carbon-monoxide, nitrogen and sulphur oxides, carcinogenic polycyclic carbon-hydride and soot;
