下呼吸道病毒感染是临床上一种常见病、多发病。

Lower respiratory channel virus infection is a frequent disease in clinic.

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上呼吸道感染是最为常见的病毒感染性疾病。

Infection of upper respiratory track is a common disease affected by virus.

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上呼吸道感染是最为常见的病毒感染性疾病。

Infection of upper respiratory track is a common disease affected by virus.

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