Those patients should be given a face mask to wear, preferably one that provides filtration of their expired air.

必须拿口罩给病患戴上，口罩最好能过滤患者呼出的空气。

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Under these circumstances, the free margins of the cords can, during phonation, be more easily blown apart by the pressure of expired air.

在这些情形下，声带闲置的边缘在发声过程中就能够更轻易的被呼出空气的压力所吹开。

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A trademark used for a device that detects and measures alcohol in expired air so as to determine the concentration of alcohol in a person's blood.

通过检测和测量呼出空气中的酒精含量，来确定某人血液中的酒精浓度的一种仪器的商标。

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