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·Tuberculosis is respiratory tract contagion.
肺结核是呼吸道传染病。
3·A non-productive cough does not expel sputum from the respiratory tract.
干咳指不从呼吸道排出痰液的咳嗽。
4·His cough was caused by an infection of the upper respiratory tract.
他的咳嗽是由上呼吸道感染导发的。
5·The secretory system of the respiratory tract is probably the most appreciated.
呼吸道的分泌系统可能是最先被意识到的。
6·An upper respiratory tract infection may precede all other symptoms in as many as 68.8% of patients.
l 68.8%的患者在所有症状之前有上呼吸道感染。
7·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。
8·Radon can cause lung cancer, leukemia, albinism and other pathological changes in respiratory tract.
氡气会导致肺癌、白血病、皮肤癌及其它呼吸道病变的产生。
9·Adenovirus-36 (Ad-36) is a highly contagious virus that normally causes upper respiratory tract infections.
腺病毒—36 (Ad - 36)，通常会导致上呼吸道感染，一种高度传染性的病毒，大约有50多种变异体。
10·The H5N1 virus tends to infect the lower respiratory tract in humans, where it can't easily get out and spread.
而H5N1病毒倾向于感染人的下呼吸道，从这里病毒很难传播出去感染其他人。