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词汇
yolk sac, yolk bag
释义
yolk sac, yolk bag
胚胎;卵黄囊从脊椎动物胚胎的中肠脐伸出的膨大的胚外囊体,富含卵黄;卵黄囊大多数哺乳动物胚胎中不含卵黄的、在胚胎发育早期变为退化器官的同源器官
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更新时间:2026/6/21 7:42:04