名词
中文翻译：卵黄囊
同义词：
['ovosphere', 'yolk sac']
例句：
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1.The mesodermal cells are responsible for the formation of the embryonic yolk sac.
中胚层细胞负责形成胚胎的卵黄囊。
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2.During development, the yolk sac is gradually absorbed by the developing fetus.
发育过程中，卵黄囊逐渐被发育中的胎儿吸收。
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3. The yolk sac is a crucial part of the early development of the embryo.
卵黄囊是胚胎早期发育的关键部分。