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.
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。
A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized.
一个世纪前，亨利·卡文迪什注意到当空气中的氧气和氮气被除去，还有其他剩余气体存在，但人们还没有认识到它们的重要性。
The pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
It flies using a 23 gallon tank of gas and burns 5 gallons per hour in the air.
它使用一个23加仑的油箱飞行，每小时在空中燃烧5加仑。
Which one costs me more gas? Using an Air conditioner or open windows?
哪个更费油？开空调还是开车窗？
In the air, where Boeing 747s get about 2 miles to the gallon—that kind of gas mileage would be revolutionary.
在空中，波音747每加仑能飞2英里——那样的油耗是革命性的。
Burning gas, oil and coal creates air pollution.
燃烧可燃气体、石油和煤炭会产生空气污染。
He decided that trees use water, and a gas from the air, to grow.
他认为树木需要水和空气中的气体来生长。
The scientist did a test and found that trees can grow because of water and a gas from the air.
科学家做了一个测试，发现树木可以生长，是因为水和空气中的气体。
Recycling or reusing these devices conserves materials, prevents air and water pollution, and reduces greenhouse gas emissions that occur during manufacturing and processing.
回收或重用这些设备能够节省材料，阻止空气和水污染。降低制造时产生的温室气体的排放。
For example, oil and air circuit breakers are now replaced by gas ones.
例如，油和空气断路器如今已被气体断路器取代。
The company implies Oregon OSHA is focusing on formaldehyde solution in the bottle, but what's important is any formaldehyde gas that escapes into the air.
公司认为俄勒冈州职业安全与保健管理总署把甲醛处理处推到风口浪尖。但是最重要的是泄露在大气中的甲醛气体。
For the environment, organising committees assess as many as 34 distinct factors over time. They include air quality, land usage trends and greenhouse gas emissions.
就环境方面而言，组委会要在一段时间内评定多达34个不同的因素，其中包括空气质量、土地使用趋势和温室气体排放。
Foodstuffs may be dried in air, superheated steam, in vacuum, in inert gas, and by the direct application of heat.
食物可以在空气、过热蒸汽、真空、惰性气体中干燥，可以用直接加热干燥。
Occurrence: Helium comes from natural gas, deposits within Earth, and can be isolated from air.
存在：氦存在于自然大气中，在土壤中沉积，而且能从空气中分离出来。
Neon, a rare gas in the air, takes only fractional percentage point of the volume.
氖是空气中的稀有气体，只占空气体积的千分之几。
Gas bubbled out and entered the air, pushing onwards the wave of warming.
这些气体冒出来溶入大气之中，导致了气候变暖的出现。
Radon gas in the air is present worldwide, its concentration depending on the highly variable uranium content of the soil.
在世界各地，空气中都存在氡气，其浓度取决于土壤中差别极大的铀含量。
Moreover, they usually stay aloft even when punctured: the pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
此外，就算被刺穿了，它们通常也能留在高空：气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
However, if exposed to heated air, the phase change from liquid to gas is more intense, and produces an efficiency of 70 percent.
然而如果该过程中加入热空气，相变过程就会加剧，达到70%的效率。
Plant have the power to take this gas from the air, combine it with water, and make it into their tissues; in fact, it is from this source that all organic carbon comes.
植物有能力从空气中吸收二氧化碳，使之与水化合转化成植物的组织，实际上，所有有机碳化合物都是通过这种方式形成的。
One, for instance, uses power produced when the wind is blowing to compress air in underground chambers; the air is fed into gas-fired turbines to make them run more efficiently.
举例来说，一项技术是通过风能将地下洞穴内的空气压缩产生电能；将空气输送至燃气涡轮机以提高燃烧功效。
One night in April, as the capital's air defences blazed wildly into the night sky, the flying Tigers dropped bombs on a gas installation and an air force base.
四月的一个夜晚，首都的防空炮火燃亮了夜空，插翅猛虎向一座加油站和一座空军基地投下炸弹。
Each individual element is perfectly styled, from the exhaust pipes to the seat and the air filters to the gas tank.
从排气管到车座，从空气滤清器到油箱，每一个元素都那么完美。
Since hydrogen gas is extremely combustible, when enough hydrogen gas is mixed with air, it reacts with oxygen. If there is enough hydrogen gas, it will react rapidly, producing an explosion.
因为氢气是高可燃气体，当足够多的氢气进入空气中，它就会跟其中的氧气反应。
A forcible stream of air, gas, or steam from an opening, especially one in a blast furnace to aid combustion.
吹风，送风从出口，尤其是从助燃鼓风炉的出口出来的空气，其他气体或蒸汽气流。
A forcible stream of air, gas, or steam from an opening, especially one in a blast furnace to aid combustion.
吹风，送风从出口，尤其是从助燃鼓风炉的出口出来的空气，其他气体或蒸汽气流。
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