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。

True, but not pure oxygen.

没错，但是那不是纯氧。

Pure oxygen is given to patients in certain circumstances.

某些情况下给病人吸纯氧。

Pure oxygen must be given patients in certain circumstances.

在某些情况下必须给病人吸纯氧。

In the new system, the coal is burned in pure oxygen instead of air.

在新系统中，煤炭在纯氧而不是空气中燃烧。

This item has been cleaned for a special service such as pure oxygen.

该产品已经清洗可用于如纯氧的特殊场合。

Nitrogen is removed from the air, enabling the fuel to burn in pure oxygen.

氮气从空气中被去除，使得燃料能够在纯氧中燃烧。

Pure oxygen must be given to patients in these kinds of circumstances.

在这些情况下，纯氧必须给病人。

In the process air is replaced by pure oxygen, and flue gas is recycled.

该技术以纯氧代替空气，并与烟气再循环相结合。

Normal air, enriched air or pure oxygen can be used to support combustion.

空气、富气、和纯氧气都可用来支持燃烧。

The kinetics of nitrification biofilm in upflow and pure oxygen has been studied.

对上向流直接供氧生物膜硝化动力学进行了试验和讨论。

And become the first in design, construction of aquaculture enterprises pure oxygen works.

并成为国内首家设计，承建水产养殖纯氧供氧工程的企业。

When he pumped pure oxygen into subjects, for example, their frequency of yawning did not change.

当他将纯氧注入实验对象时，他们打哈欠的频率并没有发生什么变化。

Inhalation of pure oxygen at atmospheric pressure or less can cause pulmonary irritation and edema after 24 hours.

在大气压或更低气压下吸入纯氧，24小时后会导致肺刺激和水肿。

Pure oxygen combustion is of great significance for cost cutting, ener- gy conserving and glass quality improving.

对目前降低成本、节省能源、提高玻璃产质量具有很重要的意义。

Methanol synthesis by pure oxygen heat exchanging conversion is developed in China but commercialized outside China.

氧 换热转化合成甲醇工艺是国内首创，并在国际上首先实现工业化。

The backpack supplies pure oxygen for the astronaut to breathe, and gets rid of the carbon dioxide he or she gives out.

背包里有氧气供航天员呼吸，并且可以排除航天员呼出的二氧化碳。

L the backpack supplies pure oxygen for the astronaut to breathe, and gets rid of the carbon dioxide he or she gives out.

背包里有氧气供航天员呼吸，并且可以排除航天员呼出的二氧化碳。

To prevent this, which underwater divers call the bends, Fournier will breathe pure oxygen for two to three hours before liftoff.

为了防止这种被潜水员称为弯曲病的病症发生，弗尔涅会在升空前呼吸2到3分钟的纯氧。

The igniting capacity of electrostatic discharge to space suits is investigated in the condition of pure oxygen and common air.

通过实验研究了在纯氧和普通大气条件下，静电放电对各种航天服的引燃能力。

Carnauba wax substitute was synthesized from paraffin and microcrystalline wax by oxidation with pure oxygen and esterification.

以石蜡、微晶蜡为原料，采用纯氧氧化、酯化工艺，合成符合天然巴西棕榈蜡指标的替代品。

When pure oxygen is inhaled at pressures greater than 2 or 3 atmospheres, a characteristic neurological syndrome can be observed.

当吸入压力大于2或3个大气压的纯氧时，可以观察到典型的神经系统症状。

You must always use pure oxygen when creating ozone for medical use, and if you don't, you sure don't use it for therapeutic purposes.

你必须始终使用纯氧在创建医用臭氧，如果你不这样做，你肯定不使用用于治疗目的。

In this paper, pure oxygen is used to stabilized large diameter mesophase pitch fibers, which was found to be more effective than air.

采用空气和氧气做为氧化介质对大直径中间相沥青纤维进行不熔化处理。

Hyperbaric Chambers are sometimes used to literally bombard the wound area with pure oxygen, boosting blood flow and encouraging healing.

高压氧舱有时被用来利用纯氧来精确轰击伤口感染区域，进而加强血流和促进伤口愈合。