level ventilation system 阶段通风系统
ventilation port level 通风窗拉杆
ventilation difficulty level 通风难易
low-level ventilation 低位置通风口
high-level ventilation 高位置通风口
bi-level mechanical ventilation 双水平正压通气
Ventilation can help reduce the level of pollutants in closed rooms, the researchers said.
通风换气可以降低密闭空间内的污染物水平，研究者们如是说。
An altered level of consciousness indicates the need for immediate reevaluation of the patient's oxygenation, ventilation, and perfusion status.
意识水平的改变意味着要对患者的氧和作用，通气和灌注状况进行重新评估。
It points out that obsolete common axial local fan copying Soviet Union (international level) is excellent local ventilation device for mine in our country.
指出被淘汰的仿苏(国际水平)普通轴流式局扇是我国优良的矿用局部通风设备。
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