名词
中文翻译：羊膜囊膜
同义词：
['maternal membrane', 'amniotic sac']
例句：
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1. The fetus is enclosed within the vitelline membrane.
胎儿被羊膜囊包裹。
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2. During pregnancy, the vitelline membrane provides a protective barrier for the developing fetus.
怀孕期间，羊膜囊为发育中的胎儿提供了一个保护屏障。
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3. The vitelline membrane is essential for the proper development of the fetus.
羊膜囊对胎儿的正常发育至关重要。