名词
中文翻译：初级空气
同义词：
['primary atmosphere', 'primary oxygen']
例句：
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1.The primary air in the cave is rich in minerals.
洞穴中的初级空气富含矿物质。
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2.Air quality is a primary concern for public health.
空气质量是公共卫生的首要关注点。
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3. The primary air was so thin that it felt like walking through cotton wool.
初级空气如此稀薄，感觉像是走在棉花糖里。