| 单词 | vitelline sac |
| 释义 | vitelline sac (extremely rare) n WORD FAMILY vitelline sac n membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional Syn|Hyper umbilical vesicle, vesicula umbilicus, yolk sac sac a structure resembling a bag in an animal |
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