名词
中文翻译：卵黄囊胎盘
同义词：
['zygote', 'blastocyst', 'trophoblast例句：1. The yolk-sac placenta is the first stage of human development.（卵黄囊胎盘是人类发育的第一个阶段。）2. During pregnancy', 'the yolk-sac placenta provides nourishment to the developing fetus.（怀孕期间，卵黄囊胎盘为发育中的胎儿提供营养。）3. The yolk-sac placenta plays a crucial role in the growth and development of the fetus.（卵黄囊胎盘在胎儿的生长和发育中起着至关重要的作用。）']
例句：
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1. The yolk-sac placenta is the first stage of human development.
卵黄囊胎盘是人类发育的第一个阶段。
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2. During pregnancy, the yolk-sac placenta provides nourishment to the developing fetus.
怀孕期间，卵黄囊胎盘为发育中的胎儿提供营养。
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3. The yolk-sac placenta plays a crucial role in the growth and development of the fetus.
卵黄囊胎盘在胎儿的生长和发育中起着至关重要的作用。