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。
2
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。
3
It points out that obsolete common axial local fan copying Soviet Union (international level) is excellent local ventilation device for mine in our country.