中国第一重型机械集团公司-新闻中心 关键词：氧气含量；气化反应；煤气成分；发热值 [gap=605]Key words: oxygen content；gasifying reaction；gas composition；calorific value
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这是我的报告：比拉密契河的主要问题之一是水中的氧气含量太低。
This is my report: One of the major problems in the Biramichi river is that the level of oxygen in the water is too low.
现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。
The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.
你还需要做一项睡眠测试，在检验中需要测量你的氧气含量水平。
You'll also need a sleep test in which your oxygen levels are measured.
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