名词
中文翻译：Unknown
同义词：
['low-density gas', 'low-density air', 'low-density vapor']
例句：
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1. The low-density gas is difficult to detect in the dark.
这种低密度气体在黑暗中难以检测。
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2. The low-density gas is a threat to human health.
这种低密度气体对人类健康构成威胁。
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3. The low-density gas was released into the atmosphere during the volcanic eruption.
这种低密度气体在火山喷发时释放到大气中。