当病人入睡后，它向病人的喉部和肺部提供持续气流。
It provides a continuous flow of air into the throat and lungs while the person sleeps.
慢性阻塞性肺病是一种以持续阻塞来自肺部的气流为特征的肺部疾病。
Chronic obstructive pulmonary disease (COPD) is a lung ailment that is characterized by a persistent blockage of airflow from the lungs.
只要有持续供应的上升气流，云朵中的小水滴就会漂浮着而不会降落。
As long as there is a steady supply of rising air, cloud droplets are buoyed up and can't fall.
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