1. If the history is positie, then it is followed by polysomnography, an oernight sleep study that usually looks at sleep stages, time in stages, oxygenation, CO2 leels, time spent in less than 90% O2 saturation, and RDI.
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co2 levels
二氧化碳水平
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But CO2 levels continue to rise.
但是，二氧化碳浓度在一直增加。
youdao
This results to higher CO2 levels and rising temperature.
其后果是 更高的二氧化碳含量和温度升高。
We can see for our own eyes what increasing CO2 levels do to marine communities'.
我们可以亲眼观察到二氧化碳含量增加对‘海洋社会’将产生什么样的影响。
This suggests that there are more, many more, things responsible for climate than CO2 levels.
BBC: Global warming: Andrew Pendleton and James Delingpole
To determine CO2 levels before the introduction of modern stations, scientists must use so-called proxy measurements.
BBC: Carbon dioxide passes symbolic mark
One of these can be used to describe CO2 levels over the past 800, 000 years.
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