名词
中文翻译：地下空气
同义词：
['subterranean', 'subterranean air']
例句：
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1.The city was built on the underair of a cave.
这座城市建在洞穴的地下空气之中。
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2. The scientists were studying the underair conditions in the deep sea.
科学家们正在研究深海的地下空气条件。
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3.The underground air is much cleaner than the surface air.
地下空气比地表空气要干净得多。