英语词汇“yolk-sac placenta”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	yolk-sac placenta
释义	yolk-sac placenta noun : a structure in some sharks resembling a placenta, consisting of the vascular embryonic yolk sac wall intimately associated with the vascular maternal uterine or oviducal wall, and serving to nourish the embryo
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