carbon dioxide
/ˈkɑrbən daɪˈɑkˌsaɪd/
a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
中文释义：二氧化碳
Plants absorb carbon dioxide and release oxygen during photosynthesis.
植物在光合作用中吸收二氧化碳并释放氧气。
Excessive carbon dioxide emissions contribute to global warming.
过量的二氧化碳排放导致全球变暖。