单词	oxygen cycle
释义	oxygen cycle noun : the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis Example Sentences Recent Examples on the Web This isn’t a call for protecting biodiversity, as noble a cause as that is, but safeguarding the carbon-to-oxygen cycle and weather regulation services of photosynthesising plants. Solitaire Townsend, Forbes, 8 June 2021 Word History First Known Use 1935, in the meaning defined above
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