In many cases, there is a reserve of oxygen left in the patient's blood and lungs, from the last breath, and we can take advantage of that oxygen reserve and just do chest compressions.

在很多案例中，在最后的呼吸中，有氧储备在病人的血液和肺中，我们可以利用那些氧储备而只做胸外按压。

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The reason of excessive oxygen content in gas main pipe of two-stage water gas gasifier during hot reserve is analyzed, and improvement measures are put forward.

分析了水煤气两段炉热备阶段煤气总管中氧含量超标的原因，提出了解决措施。

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