dioxide

Plants absorb carbon dioxide from the air and convert it into oxygen during photosynthesis.

(Chinese) 植物在光合作用中吸收空气中的二氧化碳并将其转化为氧气。

Sulfur dioxide is a common air pollutant that is released from burning coal and oil.

(Chinese) 二氧化硫是一种常见的空气污染物，由燃煤和燃油释放。