Move seven feet away, and you're "close to background, " i.e., breathing normal air.
站到七尺以外的话，你已经非常接近背景水平，也就是说呼吸到正常的空气。
The still air keeps the smoke close to the surface, exacerbating its effects on health.
静止的空气中使烟雾靠近地面,加剧其影响。
This meant an end to close air support.
这意味着关闭了空中支援。
To make an m, you have to close your mouth and the air has to come out your nose.
当发' m这个音时，你必须闭上嘴巴让空气从鼻子出来。
We live close to the water as humans live close to the air.
我们的生活与水最接近，就如人类的生活与气最接近。
Cold air, on top of warm air, with moist air close to the ground.
寒冷的空气在温暖的空气上层，而潮湿的空气接近地面。
The air close to the ground is colder than the air higher up.
靠近地面的空气，比上面的空气冷。
Open needle valve "b" to bleed air and then close "b" and vent needle valve.
开启针形阀“B”排放空气，然后关闭“B”和排气针形阀。
Aircraft noise is a particular problem here since we're close to Heathrow Air port.
在这儿飞机噪音是个严重的问题，因为我们离希斯罗机场很近。
Air solenoid valves are used to open and close the valve.
采用航空电磁阀控制阀门开闭。
Air solenoid valves are used to open and close the valve.
采用航空电磁阀控制阀门开闭。
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