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yolk sac
atonic
undyed
uncolored
uncoloured
cubital nerve
nervus ulnaris
arteria ulnaris
elbow bone
tyrocidine
vitelline sac
n.
卵黄囊
vitelline sac
英英释义
noun
1
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
Synonym: yolk sac umbilical vesicle vesicula umbilicus
数据来源：WordNet
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vitelline sac