在《清洁空气法案》强制要求美国使用无铅气体的二十年里，铅在世界范围内的累积量显著下降。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
研究人员说，患癌症和支气管炎的人数的增加可能反映了吸烟习惯的改变和空气质量的下降。
An increase in some cancers and bronchitis may reflect changing smoking habits and poorer air quality, say the researchers.
空气质量整体下降了。
海拔使得热空气下降，混合着干燥的灌木、枯树叶和人为设立的火堆的气味充斥了整个汽车。
As the elevation dropped the air heated and the scents of dry brush, dead leaves, and deliberately-set fires filled the car.
因此靠近地表的空气温度降低，使得云层下降，减少了降水的几率。
This cooled the air near the surface, drawing clouds downward and reducing the chance of rain.
通常瘦素会随着进食的减少而下降，利普认为这次是稀薄的空气导致了这种变化。
Normally, those levels fall when food intake decreases, but in this case Lippl attributes the change to the thin air.
在球运行路径的某一点(10米处，或人墙的位置)球的速度下降，使空气在球体表面形成较稳定的层流。
Some way into its path - perhaps around the 10 m mark (or at about the position of the wall of defenders) - the ball's velocity dropped such that it entered the laminar flow regime.
的确，人类的活动导致全球空气中的含氧量在以稳定的，可以测量到的幅度下降。尽管如此，但这种下降是微乎其微的。
It is true that human activity is causing a steady, measurable decline in the oxygen content of the world's air, although as yet this decline is negligible.
即使在距离火灾地点很远的地区，火灾烟尘也能使其空气质量下降。
Smoke from fires can contribute to poor air quality far from the fire itself.
当然，当他们打开，降落伞，空气阻力剧增，他们下降的更缓慢。
Of course, then they open the parachute and then the air drag increases enormously and then they slow down even further.
云层形成在圆柱形旋转气流循环的上升段，即空气抬升阶段；而沿气流循环的下降段(空气下沉)的天空依然晴朗。
Clouds form along the upward cycle in the cylinders, where air is rising, and skies remain clear along the downward cycle, where air is falling.
当炮弹在空气中运动的时候,其上升和下降的曲线形状几乎一样。
The shape of the curve when its falls is almost the same as the shape of the curve when its goin up into the air.
此外，由于引擎（发动机）外部运动较慢的空气覆盖了高温燃气排出引擎后部时的噪音，“高旁道比”（高涵道比）飞机的噪音指数下降了80%左右。
They are also some 80% quieter because the mass of slower-moving air shrouds the noisy hot gases coming from the rear of the jet.
当天下雨时，空气中就会比平时含有更少的氧气——比我们悲观估计的下降幅度更大。
When it is raining, one lungful of air will often have a few per cent less oxygen than on an average day - a larger reduction than in our pessimistic scenario above.
在纽约和克拉科夫空气污染导致的4点智商值下降是相当微妙的；父母和老师不会注意到因为许多孩子还处在正常的范围里。
The four-point drop in IQs linked to the air pollutants in New York City and Krakow is fairly subtle; parents and teachers wouldn't notice it because most children would fall within normal ranges.
为了到达火星表面，NASA设想一种空气动力着陆器，用推进器帮助它下降。
那是因为在高压系统下，冷空气沿山坡下降，并于地势低处聚集。
That's because under high-pressure systems, cold air slides down mountain slopes and pools down below.
它涉及到的化学过程如果不受妨碍的话，空气中的臭氧含量就会下降。
The chemical processes in which it is involved should work without hindrance, and ozone levels will drop.
使用从孕妇背包得到的数据，研究人员报告在1998年到2006年间空气传播的水平下降了百分之50多。
Using data from the women’s backpacks, researchers reported that airborne levels dropped by more than 50 percent between 1998 and 2006.
使用从孕妇背包得到的数据，研究人员报告在1998年到2006年间空气传播的水平下降了百分之50多。
Using data from the women's backpacks, researchers reported that airborne levels dropped by more than 50 percent between 1998 and 2006.
自1980起，美国空气中铅平均浓度已下降了93%，主要缘于逐步停止在汽油中加入铅，环保署称。
National average concentrations of lead in the air have fallen 93% since 1980, largely because of the phaseout of lead in gasoline, the EPA says.
随着水位下降，核燃料棒有可能暴露在空气中，从而增加了反应堆融化的可能性。
As water levels dipped, fuel rods were likely exposed to air, increasing the chances of melting-and of a catastrophic meltdown.
室外的一个空调装置则使用电力将空气的温度下降，下降的空气通过房间的通道送往整栋大楼。
An air-conditioning unit outside the house or building runs USES electricity to cool the air and then sends into the building through openings in the rooms of the buildings.
与身体分隔的紊乱的空气产生涡流进而造成空气阻力，使得车速下降。
Disrupted air, where the flow 'separates' from the body, creates turbulence which creates drag - which slows the car down.
光的电偶极辐射能够使正在空气中以每秒数百米飘逸的原子的速度迅速下降到每秒几毫米。
Using radiation pressure and optical dipole forces, atoms that roam in gases at a few hundred meters per second are now routinely slowed down to velocities of a few millimeters per second.
一般而言，我们所知道的所有滑翔机它们的形体结构表现出它们潜在的空气动力学……但当你看到没有任何一只蚂蚁明显显示出的直线下降能力。
In general, all the gliders that we know of have some aspect of their body shape that shows that they have some kind of aerodynamic potential... .
当飓风来到这一大片低温、干燥并且空气呈现下降趋势的地区时，它所携带的温暖、潮湿而有上升趋势的空气就会与此反作用，从而使得飓风减弱。
When the hurricane moves into this large-scale cool, dry, air-descending area, its moist, warm upwelling air is countered by it, and so it weakens.
纱布与感温球的温度下降而低于空气的温度。
The temperature of the wick and the bulb falls below that of the air.
纱布与感温球的温度下降而低于空气的温度。
The temperature of the wick and the bulb falls below that of the air.
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