名词
中文翻译：羊膜囊
同义词：
['amnion', 'chorion', 'chorioamnion']
例句：
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1.The amniotic sac is the protective layer around the fetus.
羊膜囊是围绕胎儿的保护层。
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2. Amniotic fluid is a liquid that surrounds and protects the fetus in the womb.
羊水是一种液体，环绕并保护子宫内的胎儿。
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3. Amniotic fluid can be used to diagnose fetal distress during labor.
羊水可以用来在分娩过程中诊断胎儿窘迫。