Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.
对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。
Under normal circumstances, it takes perhaps a generation for the birth rate to drop with increasing wealth, whereas carbon emissions go up very quickly.
在通常情况下，伴随着财富增长的生育率下降大约需要一代人的时间来实现，而碳排放则增长极为迅速。
Researchers can still account for nearly every drop of water and watt of sunlight, track parts-per-billion flows of carbon and oxygen, and monitor every organism.
研究人员依然能够分析几乎每一滴水、每一瓦特阳光，能够追踪碳氧流量以及监测每一种生物体。
The drop in the amount absorbed is equivalent to 405m tonnes of carbon or around 60 times the annual output of Drax coal-fired power station, which is the largest in the UK.
未被吸收的数量相当于4.05亿吨二氧化碳，或者相当于英国最大的燃煤电厂德拉克斯大约60倍的年排放量。
Some smaller changes are arguably more ominous, like a recent drop in the southern seas' ability to absorb carbon.
一些细小的变化可能更危险，比如南方海域吸收二氧化碳的能力最近下降了。
Isotopes of carbon in tree rings and beryllium in ice cores show a drop-off in solar radiation during much of the period.
树木年轮的碳同位素和冰核中钚同位素的检测都显示出在上述阶段的大多数时间内太阳辐射能量出现下降。
The researchers estimated that emissions of carbon dioxide (CO2), the main greenhouse gas, from today's stock of vehicles, buildings, and power plants would probably drop to zero by 2050.
研究人员们估计，由现存的交通工具，建筑，发电厂排放的主要温室气体二氧化碳将在2050年之前降为零。
So if you want low-carbon flying, drop-in biofuels are the only game in town.
因此加入你要低碳飞行，dropin燃料就成为城市里的唯一选择。
Carbon monoxide poisoning in the winter months is common in rural areas of northern China. Local residents sometimes burn coal to keep warm when temperatures drop.
在中国北方农村地区，冬季一氧化碳中毒经常发生。气温下降时，当地居民有时烧煤取暖。
Discusses the significance of spreading the carbon-potential control of drop-type carburation, points out two ways of realizing this control:atmosphere controllability and suitable control instrument.
本文讨论了推广滴注式渗碳碳势控制的意义，指出了实现这一控制的两个关键：气氛的可控性及合适的控制仪器。
The carbon isotope shifts during Upper Permian in the South China drop gradually, and such phenomena may correspond to sea level change.
华南晚二叠世的碳同位素变化曲线是逐渐降低的，与全球海平面变化趋势相一致。
In the use of the anode carbon block cycle, as anode was consumed, lead anode carbon block anode institutions to drop, to guarantee the stability of cell pole pitch.
在阳极炭块的使用周期内，随着阳极被逐渐消耗，阳极机构带动阳极炭块下降，以保证电解槽稳定的极距。
But because of a drop in energy efficiency and an increase in industrial proportion of GDP, China's carbon intensity rebounded again.
但是，由于近年来能源效率下降和工业比重上升，中国的碳强度又出现反弹。
Finally, pressure drop of traditional bed loaded with different carbon particles size at4060 mesh, 6080 mesh and 80100 mesh was discussed.
最后，本文考察了粒径在4060目、6080目以及80100目三种不同粒径活性炭装填的动力管压降性能；
Studying on drop temperature effect, add humidity effect, balance of carbon and oxygen effect, absorbing dirt effect, killing germ effect, decreasing noise effect and air anion effect.
分析了绿地系统的降温效应、增湿效应，碳氧平衡效应，吸尘、杀菌、减噪效应和空气负离子效应。
Quasi-static and dynamic compression experiments of carbon fiber reinforced epoxy resin matrix composite cylinder structures are implemented by NYL-200D testing machine and drop weight equipment.
利用NYL-200D型压力实验机和落锤装置对圆筒形碳纤维增强环氧树脂基复合材料结构进行了准静态和动态冲击压缩实验。
Improvement in energy efficiency makes carbon intensity drop, and an increase in the proportion of the industrial value of GDP raises the carbon intensity.
能源效率改进使碳强度下降，工业增加值比重上升使碳强度上升。
Along with the increase of the content of carbon, its hardness and strength increased, but the corresponding plastic drop, increase the brittle.
随着碳含量的增加，其硬度和强度增加，但相应的塑性下降，脆性增加。
A method has been developed to measure the carbon distribution and content of microcrystal wax with high drop melting point.
该蜡具有适宜的烃组成和碳数分布，具有较高的熔点，可在较宽的温度范围内保持良好的防护性能。
It is controlled by computer and driven by DC brushless motor without carbon powder pollution. It is self-balance running with low noise and slight vibration. The speed rise or drop quickly.
微机控制，直流无刷电机驱动，无碳刷粉尘污染，快速升降速，操作简便，自动平衡，噪声低，振动小。
The entire system consists of a compact, lightweight pulse control panel and carbon fiber drop-in pans. The only external equipment required is a compressed air source.
整套系统包含一个紧凑、轻便的脉冲控制面板和碳纤维岩屑盘，唯一所需的外部设备是一个压缩空气源。
The relationship between the carburizing atmosphere of drop-feeding carburization and the carbon-patential is discuased in this poper.
探讨了滴注式渗碳气氛组成与碳势的关系。
American type, drop-forged blades with high quality carbon steel, body heat treatment, cutting edges induction quenched, easy adjustment, cutting abilityHRC30.
美式结构，刀头优质碳钢锻压，整体热处理，刃口高频感应淬火，刀片上偏心螺栓调节间隙，剪切硬度HRC30。
The bimetallic planing chips for carpenters were made by drop-forging high speed steel powder in carbon-steel (0. 45%C)containers.
采用高速钢粉末与45号钢套自由锻造工艺，制造双金属木工刨刀片。
The carbon blue mildew alkenes medicine in 2005,2006 year maintains 95% above sensitive rate, in 2007 starts its sensitivity to drop suddenly, in 2008 sensitive rate has 30%;
碳青霉烯类药物在2005年、2006年度保持95%以上的敏感率，2007年开始其敏感性急剧下降，2008年敏感率只有30%；
The carbon blue mildew alkenes medicine in 2005,2006 year maintains 95% above sensitive rate, in 2007 starts its sensitivity to drop suddenly, in 2008 sensitive rate has 30%;
碳青霉烯类药物在2005年、2006年度保持95%以上的敏感率，2007年开始其敏感性急剧下降，2008年敏感率只有30%；
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