名词
中文翻译：肺泡标志物
同义词：
['pulmonary surfactant', 'alveolar liquid', 'lung fluid']
例句：
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1. Thepresence of vallecular sign is associated with a reduced risk of respiratory distress syndrome in premature infants.
肺泡标志物的存在与早产儿呼吸窘迫综合征的风险降低有关。
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2. Researchers are studying the role of vallecular sign in the development of chronic obstructive pulmonary disease.
研究人员正在研究肺泡标志物在慢性阻塞性肺疾病发展中的作用。
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3.The study found that vallecular sign levels were significantly higher in patients with cystic fibrosis compared to healthy controls.
研究发现，囊泡标志物水平在患有囊性纤维化的患者中显著高于健康对照组。