carbon dioxide
n.
二氧化碳
新牛津英汉双解大词典
carbon dioxide
noun
[mass noun]a colourless,odourless gas produced by burning carbon and organic compounds and respiration.It is naturally present in air (about 0.03 per cent) and is absorbed by plants in photosynthesis
二氧化碳
Chem.formula:CO2.
化学分子式：CO2