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.
纯空气是无色无臭的。
如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。
If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.
虽然月球上这种相互作用过程的长期效应并不显见，但是“相似的过程将在整个太阳系内部无空气、富含硅酸盐的天体上发生。”她这样说道。
Although the long-term effects of this interaction on the moon are unknown, "this same process should be occurring on airless, silicate-rich bodies throughout the inner solar system," she says.
汽车排放的尾气严重污染了达卡的空气，随着无铅汽油的出现略改善了空气的质量，但是有毒的一氧化碳气体依旧存在着。
Dacca's air is burdened by vehicleemissions; air quality improved after the advent of unleaded gasoline, but toxins such as carbon monoxide persist.
鸭式无尾翼布局具有高度机动性和优越的超音速性能，但亦具有先天空气动力上之不稳定性。
The tailless delta-canard configuration is inherently aerodynamically unstable, which provides a high level of agility, particularly at supersonic speeds.
当碳与氧结合形成一种无色、无味、无嗅的气体叫做二氧化碳，它比空气重，可以灭火。
When carbon unites with oxygen, it forms a colorless, odorless, and tasteless gas called carbon dioxide, which is heavier than air and will extinguish a flame.
所以我奔跑，不像无定向的。 我斗拳，不像打空气的。
I therefore so run, not as uncertainly; so fight I, not as one that beateth the air
在阿肯色州，1991年10月3日，这是一个美丽的秋日早晨，空气清爽、万里无云。
October 3 was a beautiful autumn morning in Arkansas, crisp and clear.
无热再生吸附式干燥机一般要消耗15%左右的再生压缩空气。
No heat regenerative adsorption dryer to consume about 15% of the regeneration compressed air.
只有无油空气压缩机才能产生无油的压缩空气。
Only no oil to produce an air compressor oil free compressed air.
这就是为什么要采用无油压缩空气的解决方案的原因，无油空气压缩机用在需要高纯度压缩空气的场合。
This is why should use no oil compressed air solutions of reason, no oil air compressor in need with high purity compressed air occasion.
当空气填料被允许而且是适当的时候，所引入的空气必须是洁净的、无油的、冷却的、干燥的压缩空气。
When air padding is allowed and appropriate, it is imperative that clean, oil-free, cooled, dry compressed air be introduced into the vapor space.
可通过设备的侧面部分有选择性地进行空气压力调节，使无接触气垫转向器能够补偿翘曲的卷筒纸和不均匀的张力。
The unit's lateral sectors permit selective air pressure adjustment across its entire width, allowing the Air Turn to compensate for cambered webs and uneven tensions.
无放流式调节器只有在通至调节机构的管道排气时才消耗空气。
The non-bleed controller uses air only when exhausting the line to the controlled device .
只有当将要涂敷的表面清洁，干燥且无空气污染时，才可以进行补口涂敷，这些因素都可能影响补口涂层的质量。
Field joint coating shall be performed only when the surfaces to be coated are clean and dry, and in the absence of airborne contamination that can affect the quality of the joint coating.
压缩空气的分配管道系统无例外地都是用焊接管件的铜管。
Air distribution piping systems almost invariably use soft copper tubing with soldered fittings.
石羊毛的无营养价值，使它具有抵抗有害细菌和霉菌导致皮肤感染、肺炎和其他空气疾病的功能。
Stone wool offers no nutritional value, making it naturally resistant to harmful bacteria and molds that cause skin infections, pneumonia and other airborne illnesses.
无空气喷涂在大面积涂装的领域内，代替了传统的喷涂施工。主要原因如下。
Airless spraying had replaced conventional spraying for painting of large surfaces for the following reasons.
快速卷帘门是快速升降的无障碍隔离门，主要作用是起快速隔离的作用从而保证车间空气质量无尘等级。
Fast shutter door is a barrier for the rapid rise and fall of the barrier, the main role is to play a role in the rapid isolation to ensure that the air quality of the workshop clean grade.
第一个空气流使峰值振幅大大降低，以后就保持在无气帘时振幅的0.1到0.2倍。
The peak amplitude is decreased substantially by the first air stream and thereafter remains between 0.1 and 0.2 of the amplitude without air curtains.
当时，诸如空气清新、水质洁净无噪声污染之类的问题，都不是公众什么了不起的关切所在。
Such issue as clean air, pure water and freedom from noise pollution were not important public concerns.
甲基叔丁基醚(MTBE)作为一种新型的无铅汽油添加剂被广泛应用以减少含铅汽油对空气的污染。
Methyl tert-butyl ether (MTBE) is widely used as an addictive in unleaded gasoline to curb the air pollution caused by leaded gasoline.
无人驾驶自由气球，是指无动力驱动、无人操纵、轻于空气、总质量大于4千克自由漂移的充气物体。
An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.
结果显示对已设计好的无空气干燥机，干燥速率提高，空气置换时间明显缩短；
The results showed that at higher evaporation rate the air replacement time can be reduced.
电缆产品内无对空气、土壤、人身造成的污染和危害的有毒助剂，属绿色环保型电缆。
There is no poisonous content in this cable to pollute air, earth and human. It is a kind of environmental protection cables.
交通停滞、空气污染、马路拥挤、无休无止的灰色人行道。是不是听着耳熟?。
Stand-still traffic, air pollution, crowded streets, endless gray sidewalks. Sound familiar?
交通停滞、空气污染、马路拥挤、无休无止的灰色人行道。是不是听着耳熟?。
Stand-still traffic, air pollution, crowded streets, endless gray sidewalks. Sound familiar?
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