采摘植物plucked a plant 排放较少一氧化碳reduce emissions of carbon monoxide 清除某物的不断积压clear the mounting backlog of something ..
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Catalytic converters reduce carbon monoxide, oxides of nitrogen, and volatile organic compounds in emissions and necessitated the use of lead-free fuel.
催化转炉减少了一氧化碳，氧化氮和挥发性有机混合物等的排放，而且无铅燃料的应用也当成为必要。
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