他的咳嗽是由上呼吸道感染导发的。
They may also irritate the upper respiratory tract, causing coughing, choking, and general debility.这些也能刺激上呼吸道,引起咳嗽、窒息和全身虚弱感。
Objective To observe the potency of ribavirin used with nose drops to cure infants'acute infection of the upper respiratory tract.目的观察用病毒唑滴鼻治疗婴幼儿急性上呼吸道感染的疗效。