During the air pollution red alert, the Beijing Commission of Education ordered all kindergartens, primary schools and middle schools to suspend classes.
在空气污染红色预警期间，北京市教委下令让所有幼儿园、小学和中学停课。
Tobacco use, indoor and outdoor air pollution and occupational dusts and chemicals are the primary risk factors.
烟草使用、室内外空气污染与职业灰尘和化学品是主要的高危因素。
There are two primary types of no-fly zones imposed by air forces.
目前主要有两种由空中打击力量形成的禁飞区。
Before I could do any downloads, I waited until the first day of the next month when the air-card service provider reset the data-transfer counter to zero on my primary computer.
在我进行下载之前，我等到了下一个月的第一天，因为在这一天，我的无线卡服务提供商会把我主计算机上的数据传输量归为零。
The boats may possess cruise-ship comforts - bars, a restaurant and open-air Jacuzzi - but their primary purpose is to keep viable Norway's Arctic north.
这些船可能具备游轮的设施——酒吧、餐厅和露天浴池，但他们的主要目的是保持挪威北极圈以北的旅途可行。
The primary purpose of the KC-135 Stratotanker is aerial aircraft refueling for air Force, Navy, Marine Corps, and allied nations.
KC- 135“同温层加油机”主要用于为美空军、海军和海军陆战队及美国的盟军进行空中燃料补给。
Air pollutants are separated into two categories: primary pollutants and secondary pollutants.
污染物可分为两类别：主要染物及次级污染物。
Primary standard — an ambient air pollution standard designed to protect human health.
基本标准——一个旨在保护人类健康的周围空气污染级别。
Ever since I started using my new MacBook Air as my primary non-work laptop, I've been frustrated that you can't just click on the clock to show the calendar, the way Windows 7 does.
自从我开始使用新MacBook Air作为我的非工作笔记本，对于不能像在Windows 7系统里面那样在时钟上点击后弹出日历这一点，我觉得有点失望。
Safety is the base of air transport, the primary objective of all matters of air transport enterprises.
安全是航空运输的基础，是航空运输企业一切事务的首要目标。
He says, "I plan to develop an Adobe Air desktop application for asDox." But, right now my primary focus is on getting asDox to a 1.0.0 release.
他说：“我计划为asdox开发一个Adobe Air桌面应用，但目前，我首先需要将精力集中在asDox 1.”0.0的发布上。
The test shows that size distribution of feeding coal, volatile content and its release as well as the total air rate and primary air ratio will influence the post combustion in CFB boiler.
测试结果表明，影响后燃现象的主要因素是给煤的粒度分布、煤挥发分含量及挥发分析出规律，同时与炉膛内总风量、一二次风量的配比有关。
Parachute deceleration systems are a primary means of recovery and landing of air and space vehicles.
降落伞减速系统是空中和空间飞行器回收着陆系统的主要方式。
Exhaust emission of vehicle engines is one of the primary air pollution sources.
车用内燃机的废气排放是大气污染的主要污染源之一。
The aircraft engines are the primary source of compressed air in flight. The air is bled from the 7th or 10th stage of the engine High Pressure (HP) compressor.
飞行中，发动机是主要的气源。空气由发动机高压压气机第7级或第10级引出。
At the same time the vehicle exhaust has become the primary source of air pollution in big cities.
同时在我国大城市机动车排气污染已成为城市空气污染的主要源头。
When the primary air blast wave from the explosion strikes the ground another blast wave is produced by reflection.
当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。
In the application of central air-conditioning, the technology of variable-frequency primary pump has been widely studied.
在中央空调的应用过程中，冷冻水一次泵变频技术得到了广泛的研究。
Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。
In experiment, steady operating point of combustion can be obtained mainly by setting primary air factor and the size of spout.
在实验中，主要通过调整一次空气系数和引射器喷口的大小，达到稳定燃烧的运行工况。
Based on the experimental result and flame stability theory, the possibility to obtain the optimum parameters of the burners are discussed under different primary air coefficient.
在实验结果的基础上利用火焰稳定理论，论证了在不同一次空气系数时获得最佳燃烧器参数的可能性。
The direct type of evaporative air cooler uses primary wet surfaces.
直接蒸发式空气冷却器是利用原有的湿表面工作的。
The curve of relationship between flame speeds and the primary air ratio is got, and when primary air ratio is about 0.
得出了二甲醚火焰传播速度与一次空气系数的关系曲线，并且在一次空气系数约为0。
A new type dual complex turbulent combustion method of primary and secondary air is put forward, and its effective action on combustion process is analyzed.
提出了一种新型的一、二次风双重复合旋流燃烧的方法，并且分析了其对燃烧过程的有效作用。
The numerical simulation of the injector of atmospheric gas burner is carried out using software FLUENT, and the relationship between nozzle position and primary air coefficient is obtained.
采用FLUENT软件对大气式燃气燃烧器的引射器进行数值模拟，得出喷嘴位置与一次空气系数的关系。
It is shown that both the ignition and the combustion efficiency can be significantly improved and the ratio of primary air can be greatly increased.
试验结果表明，钝体可显著改善劣质煤着火情况和大幅度提高燃烧效率，并可允许大幅度提高一次风率。
In comparison with the conventional tangentially fired system, the horizontal bias burner and the twin circles of the primary air are two main improvements.
与传统的切圆燃烧系统相比，水平浓淡燃烧器和同层一次风双向切圆布置是该系统的主要改进之处。
The structural parameters of kinematics has a supreme comparability between primary and secondary air cylinder, and the consistency and stability of torque and friction can be better.
具有主、副气缸运动学上最大相似性的结构参数，可使得主、副气缸的摩擦力和扭矩尽量一致及平稳性更好。
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