PURPOSE: To determine the effects of systemic hyperoxia and hypercapnia on choroidal bood flow in anesthetized rats, during pure oxygen (100%O2) or carbogen (95%O2 + 5%CO2) breathing.
目的：观察纯氧（100%O2）和carbogen气体（95%O2+5%CO2）对正常大鼠脉络膜血流量的影响，为临床氧二氧化碳混合气的应用提供理论依据。
参考来源 - carbogen气体对大鼠脉络膜血流灌注量的影响Pure oxygen was prepared for oxidative air source by pressureswing adsorption process. The process could reduce the size ofthe reaction vessel, simplify the disposal of tail gas, lowerproduction and overhaul costs.
以变压吸附制纯氧替代空气作氧化气源，缩小反应器尺寸，减少尾气处理负荷，能降低生产费用、减少检修成本。
参考来源 - 改善乙醇氧化制乙酸工艺经济性的途径·2,447,543篇论文数据，部分数据来源于NoteExpress
If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.
如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。
Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
Volunteers were told to think about yawning, while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
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