名词
中文翻译：氧气含量
同义词：
['oxygen level', 'oxygen percentage']
例句：
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1.The air in the room is very low in oxygen content.
房间里的空气中氧气含量很低。
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2.The scientist measured the oxygen content of the sample.
科学家测量了样本的氧气含量。
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3.The study found that the oxygen content in the atmosphere has been increasing.
研究发现大气中的氧气含量一直在增加。