di-, 二。oxide, 氧化物。

1. The two principal combustion products are water vapor and carbon dioxide.

两种主要的燃烧产物是水蒸气和二氧化碳。

2. Mars has an insubstantial atmosphere, consisting almost entirely of carbon dioxide.

火星的大气层极其稀薄，几乎全部由二氧化碳构成。

3. Carbon dioxide is a necessary result of the oxidation of carbon compounds.

碳化合物氧化后必然会产生二氧化碳。

4. The proposed initiative would mandate a reduction of carbon dioxide of 40%.

倡议将强制规定把二氧化碳排放量降低40%。

5. the emission of carbon dioxide into the atmosphere

向大气排放二氧化碳