Examples
shù mù树木pái排chū出yǎng qì氧气，xī shōu吸收èr yǎng huà tàn二氧化碳。
树木排出氧气，吸收二氧化碳。
Trees give off oxygen and absorb carbon dioxide.
二氧化碳是燃烧煤、石油或天然气这样的燃料时会产生的气体。
Carbon dioxide is a gas that is produced every time a fuel such as coal, oil, or natural gas is burned.
这个词指的是由于大气层里二氧化碳含量增多而导致全球变暖。
It is a term used to describe the warming of the earth due to increasing amounts of carbon dioxide in the atmosphere.