They breathe through uncomfortable respirators or carry heavy oxygen tanks on their backs.
他们或通过防毒面罩，或携带沉重的氧气瓶进行呼吸。
Researchers said the zircon's high level of heavy oxygen isotopes suggest it was cooled by surface water after it formed.
研究人员说锆石的高标准重氧同位素暗示了它形成之后靠地表水来冷却。
They then used local snowfall records to find the relationship between precipitation and the proportion of heavy oxygen in tree rings for the years covered by the weather records.
他们然后使用当地的降雪记录来寻找有气象记录的年代里降雪量和树木年轮中氧元素同位素的比率之间的关系。
Heavy elements are equally essential for life: Witness the oxygen we breathe, the calcium in our bones, the iron in our blood.
重元素同样是生活的必需品：其证据是我们呼吸的氧气、我们骨骼中的钙、我们血液中的铁。
Scientists say the excess heavy nitrogen could have come from a comet. And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
科学家认为重氮来自一颗彗星，而重氧则是来自行星形成的自然过程，这一过程把更轻的氧同位素留在了星云中，形成了太阳。
These youngsters had low supplies of heavy elements-for example, their oxygen content was only 20 percent of the sun's.
这些年轻的恒星提供的重元素很少——例如，它们的含氧量仅为太阳的20%。
Before it can be released back into the nearby watercourses it has to meet stringent standards, including maximum levels of ammonia, heavy metals and any chemicals that might cause oxygen depletion.
在渗滤液释放回附近的河道之前，必须得让它们符合严格的标准。其中包括氨、重金属以及任何化学物的最大指标，它们都很可能导致氧元素的损耗。
Like penguins, these small birds endure brutal nesting conditions for weeks on end - low oxygen, bitter cold, heavy snow and high winds.
像企鹅们一样，这些小鸟们也得忍受好几个星期的恶劣筑巢条件——低氧、严寒、暴雪、狂风。
The moon's low gravity also means that water composed of regular hydrogen and oxygen will escape quicker than heavy water, perhaps leading to a concentration of deuterium in the water of the moon.
月球的低重力也意味着由普通氢气和氧气组成水将会比重水更快的消失，可能导致在月球上水的氘含量。
The heavy lifting is done by the nine-engine cluster, fuelled by kerosene and liquid oxygen.
采用煤油和液体氧为燃料的9台捆绑式发动机负责提升重物。
They would leave subtle clues in the isotopic composition of the limestone by shifting the ratios of light to heavy carbon and oxygen atoms in its calcium carbonate.
因为如果是那样的话，阳光将会被转换成大量的碳、氧原子保存到石灰岩中的碳酸钙里，而事实却是，岩层的同位素组成（Isotopic composition）中没有留下任何蛛丝马迹。
Objective To investigate the significance and therapeutic value of control oxygen therapy of respiratory mechanism for heavy brain injures.
目的探讨重型颅脑损伤治疗中呼吸机控制性氧疗的重要性及治疗价值。
Sulfur is twice as heavy as oxygen.
硫是氧的两倍那么重。
Compared with hydrogen, oxygen is nearly 16 times as heavy.
氧与氢比较，重量大约是它的十六倍。
The formation of heavy oil reservoirs is chiefly controlled by late uplifting of the basin, biodegradation, water-washing, and free oxygen oxidizing.
重质稠油藏的形成主要受盆地后期抬升活动、生物降解、地层水洗和氧化作用等因素控制。
The heavy demands of her job; the emotional demands of his marriage; an increased oxygen demand.
她工作的高强度要求；他婚姻上的情感要求；增长的氧气需求。
Regions of the galaxy that are rich in heavy elements generally, such as the galactic center, have higher carbon-to-oxygen ratios.
在宇宙里一些含有大量重元素的地区如银河系中心里，一般都有较高的碳氧比例。
Our compact, lightweight and travel-approved portable oxygen concentrators are designed to free patients from heavy tanks, managing tank refills or being tethered to stationary systems.
我们的小型化，轻量化和旅游批准的便携式制氧机是由重型坦克，管理箱笔芯或者被拴到固定的系统，对自由的患者。
Anaerobic bacteria often do not require oxygen, can survive extremes in temperature, and can withstand the presence of toxins and heavy metals.
嫌气的细菌经常不需要氧，能在温度方面经历极端之后幸存，并且能禁得住毒素和重金属的存在。
Objective To observe the curative effect of heavy-oxygen-enriched water (HOEW) on obviating acute high altitude reaction.
目的观察富氧水对高原人体力竭运动血乳酸及尿素氮的影响。
Objective To observe the curative effect of heavy-oxygen-enriched water (HOEW) on obviating acute high altitude reaction.
目的观察富氧水对高原人体力竭运动血乳酸及尿素氮的影响。
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