柯林斯詞典carbon dioxide /?kɑ?b?n da???ksa?d/ 1. N-UNCOUNT Carbon dioxide is a gas. It is produced by animals and people breathing out, and by chemical reactions. 二氧化碳 返回 carbon dioxide劍橋詞典the gas formed when carbon is burned , or when people or animals breathe out 二氧化碳 carbon dioxide emissions 二氧化碳排放 例句 Plants absorb carbon dioxide during photosynthesis .A molecule of carbon dioxide (CO2) has one carbon atom and two oxygen atoms .Microbes decompose organic waste into a mixture of methane and carbon dioxide .The increased use of natural gas will help reduce carbon dioxide emissions.There has been a sudden and worrying rise in the level of carbon dioxide in the atmosphere . 返回 carbon dioxide