If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.

如果刺激足够剧烈，睡着的人就会醒来并清理气道，恢复呼吸，并很可能再度陷入睡眠中。

youdao

Finally, the coughing reflex in reaction to irritants in the airway produces not a cough during sleep but a cessation of breathing.

最后，对呼吸道刺激物的咳嗽反射不会导致人们在睡眠期咳嗽，而会造成呼吸暂停。

youdao

Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces.

健康的肺部会产生一种天然的抗生素，通过杀死呼吸道表面的有害细菌来保护肺部不受感染。

youdao

The first thing a paramedic has to do is ensure the patient can breathe properly, that their airway is clear - vital to prevent brain damage.

BBC