名词
中文翻译：二氧化碳
同义词：
['co2', 'carbon dioxide gas']
例句：
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1.Carbon dioxide is a greenhouse gas that contributes to global warming.
二氧化碳是一种温室气体，它导致全球变暖。
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2.The scientist found that the concentration of carbon dioxide in the atmosphere has increased significantly.
科学家发现大气中的二氧化碳浓度显著增加。
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3.The city's air quality has improved significantly since they implemented stricter regulations on carbon dioxide emissions.
自从实施了更严格的二氧化碳排放规定以来，该城市的空气质量已经显著改善。