1·In humans, coronaviruses cause respiratory tract infections.
冠状病毒在人体内会引起呼吸道感染疾病。
2·One feature seen in many patients is the development of lower respiratory tract early in the illness.
在许多患者身上观察到的一项特征是，疾病初期会出现下呼吸道症状。
3·Undernutrition increases the risk of upper respiratory tract infections and subsequent acute bronchitis, especially in children and older people.
营养不良增加上呼吸道感染的风险从而发生急性支气管炎，特别是儿童和老人。
4·Swine influenza (swine flu) is an acute viral infection of the respiratory tract in pigs caused by type A influenza virus.
猪流感是一种发生在猪身上的高度传染性急性呼吸道疾病，由A型流感病毒引起。
5·Children who live with smokers are more likely to develop middle ear infections (otitis media) and lower respiratory tract infections.
与吸烟者生活在一起的儿童容易患中耳炎和下呼吸道感染。
6·After his daughter found him and called an ambulance, the old man died "because of a respiratory tract clogged by a nosebleed".
他女儿发现了之后赶紧叫了救护车，但是这位老人仍然因为鼻血堵塞呼吸道而窒息去世。
7·After his daughter found him and called an ambulance the old man died "because of a respiratory tract clogged by a nosebleed".
他女儿发现了之后赶紧叫了救护车，但是这位老人仍然因为鼻血堵塞呼吸道而窒息去世。
8·After all, flu viruses work this way; they destroy the cells of our respiratory tract, wreaking havoc in our airways.
毕竟，流感病毒就是这样的，它们破坏我们呼吸道的细胞，扰乱我们的通气孔。
9·Inflammation of the respiratory tract causes coughing, mucus secretion, aggravation of asthma and chronic bronchitis and makes people more prone to infections of the respiratory tract.
呼吸道的炎症导致咳嗽、粘液分泌、加重哮喘和慢性支气管炎并使人们更易患呼吸道感染。
10·The low rate of transmission to persons with casual contact suggests that aerosol transmission via the respiratory tract is not efficient, if it occurs at all.
偶然接触者的低传播率表明，如果确实发生，经过呼吸道的空气传播是无效的。