respiratory tract

例句：

1. 1.The doctor examined the patient's respiratorytract to rule out any infections.
   医生检查了患者的呼吸系统，以排除任何感染。
2. 2. Thestudy focused on the respiratorytract as a potential site for pathogenic bacteria.
   该研究关注呼吸系统作为潜在病原体细菌的场所。
3. 3. Duringsleep, the respiratorytract is at its most vulnerableto infection.
   在睡眠期间，呼吸系统最易受到感染。