retinal vein obstruction 释义：视网膜静脉阻塞 lower respiratory tract obstruction 释义：下呼吸道阻塞 diffuse obstructive lung disease 释义：弥漫性阻塞性肺部疾病 ..
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MAS infants have been sensitized in utero, exacerhating lower respiratory tract obstruction when breathing, that become a hidden danger to the occurrence of asthma in children.
MAS患儿在宫内已致敏，其发生喘息时下呼吸道阻塞更严重，为儿童哮喘的发生埋下了隐患。
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