名词
中文翻译：氧气的空隙浓度
同义词：
['oxygen concentration', 'oxygen partial pressure']
例句：
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1. The scientist measuredthe concentration of oxygen in the air.
科学家测量了空气中氧气的浓度。
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2.The concentration of oxygen in the water is critical for survival.
水中氧气的浓度对生存至关重要。
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3.The concentration of oxygen in the atmosphere has been declining due to human activities.
由于人类活动，大气中的氧气浓度正在下降。