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.
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。
Scientists are not certain why the oxygen level dropped.
科学家们现在还不能断定为什么含氧量会下降。
Use the VTI oxygen Analyzer for "spot checks" in instances when an oxygen level alarm is not necessary.
不需要含氧量警报时，使用VTI氧气分析器进行抽查。
The proven VTI Oxygen Monitor is the system you want working for you when oxygen level alarms are needed.
已经证实的VTI氧气监测仪是需要含氧量警报时的理想产品。
In the process of glutamic acid fermentation, dissolved oxygen level was one of the most important factors.
在谷氨酸发酵过程中，溶氧水平是影响发酵的重要因素之一。
For critical applications an alarm can be set to activate should the oxygen level exceed a set control limit.
对于关键应用报警可设置为激活应该含氧量超过了一套控制上限。
In fact, many experts believed that the oxygen level was only about two percent of the atmosphere so long ago.
事实上，很多专家认为那么久远之前的氧含量大约只占到大气的2%。
At the bottom of the ladder we squat in a narrow passage, while Anne-Marie Leparmentier, a geologist, measures the oxygen level.
在梯子的底部我们蹲着移入一条狭窄的通道，与我们同行还有一位叫安妮玛丽.丽帕米蒂尔的地质学者，她的工作是测量空气含氧量。
The arterial oxygen level and liver function were measured by automatic blood gas analyzer and automatic biochemistry analyzer.
分别用自动血气分析仪检测动脉血氧水平和自动生化分析仪检测受试对象肝功能状态。
With some hazardous materials, you can provide further protection by using inert gas to limit the oxygen level in the vacuum dryer.
随着一些有害材料，可以提供进一步的保障真空干燥机使用惰性气体中氧气含量的限制。
Conclusion Ginkgo biloba extracts is a promising therapy for POCD and the potent mechanism is improved blood oxygen level in the brain.
结论：银杏提取物是一种有应用前景的预防术后认知障碍的药物，其机制可能与改善脑组织血氧水平有关。
Plus, caving can be a very healthy sport, for the oxygen level is usually higher so basically you are having an oxygen spa as the bonus.
此外，洞穴探险也是项十分健康的运动，因为那里通常氧气含量较高，所以基本上你还可以额外享受一次氧气spa。
This would be difficult to explain if oxygen levels fell below 15 per cent, as Berner's model suggests, because fires should not occur below this level.
伯奈尔的模型暗示，如果含氧量降到15%，这情况会很难想象，因为火在那样的含氧量条件下是不能燃烧的。
Controlling the oxygen level within the curing chamber is simply a matter of adjusting the nitrogen flow rate until the desired reading is obtained.
控制范围内氧气水平的固化室是一件简单的事，调整氮气流量，直至理想的阅读获得。
Poor blood circulations affect the oxygen level in our body, we are creating a body environment for many health problems like heart disease and cancer.
血液循环不通畅，会导致身体缺氧，让许多疾病如心脏病和癌症有机可乘。
It may also be a good idea to add a few additional oxygenating plants to the pond to stabilize the oxygen level and keep algae from taking over the pond.
这也可能是一个好主意，添加一些额外的充氧植物的池塘，以稳定的氧气水平，不断从接管藻类池塘。
People with trouble sleeping can use this app to record their blood-oxygen level during the night — data that can help a doctor diagnose whether they have sleep apnea.
有睡眠障碍的人可在晚间使用该应用记录他们的血氧饱和度——该数据可帮助医生诊断他们是否患有睡眠呼吸暂停症。
Objective To assess the value of blood oxygen level-dependent magnetic resonance imaging (BOLD-MRI) in diagnosis and prediction of early acute renal transplant rejection.
目的探讨血氧水平依赖的功能磁共振成像（BOLD-MRI）在早期移植肾排异中的诊断和预测作用。
The accumulation of lactic acid in lowly dissolved oxygen level fermenting liquor made the glucide quickly consumed, as a result, the conversion rate of glucose was on the low side.
低溶氧水平发酵液中乳酸的大量积累，耗糖快、最终糖酸转化率偏低。
As soon as the blood oxygen level drops the carotid chemoreceptors get stimulated, which then reports to the brain and is followed by a massive increase in sympathetic nerve activity.
血氧水平下降，颈动脉化学感受器就会感受到刺激，向大脑汇报低氧信息，之后交感神经活性就会大大增高。
Ultrafine pulverized-coal contained in the tertiary air was used as the reburning fuel and the oxygen level of the tertiary air was reduced with the use of flue gas recirculation(FGR).
本文在注蒸汽联合循环和余热锅炉型联合循环的基础上提出了采用烟气再循环和燃烧室回注水的燃气轮机循环，并对其进行了分析和优化。
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.
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。
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。
The level of oxygen is very high in water, and you will not have any breathing problems.
水中的含氧量很高，所以你不会有任何呼吸方面的问题。
The level of oxygen in our blood will actually decrease to levels that would be considered a medical emergency.
血液含氧量可能会下降到被认为需要紧急救护的水平。
The level of oxygen in our blood will actually decrease to levels that would be considered a medical emergency.
血液含氧量可能会下降到被认为需要紧急救护的水平。
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