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。

youdao

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。

youdao

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。

youdao

Smoke travels upwards, and if smokers are confined to the top level and adequate ventilation is in place (be it an open window or a small fan), then there can be no cause for concern to those non-smokers who sit downstairs.

BBC: TRAPPED BY INCONSIDERATE SMOKERS