释义 |
英语解释
- membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
- membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
相似短语
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yolk sac
n.(=yolk bag)[动]卵黄囊
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internal yolk sac
内卵黄囊
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yolk sac tumor of ovary
卵巢卵黄囊瘤
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chick embryo yolk sac
鸡胚卵黄囊
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blood island of yolk sac
卵黄囊血岛
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yolk sac endoderm
卵黄囊内胚层
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yolk sac antigcns
【医】 卵黄囊抗原
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yolk sac umbilicus
【医】 卵黄囊脐
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yolk sac endoderm
卵黄囊内胚层
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external yolk sac
【医】 外卵黄囊
相似单词
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yolk sac
卵黄囊
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yolk
n.[U,C] 蛋黄
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SAC
abbr.
(英国)皇家空军一等兵(Senior Aircraftman)
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sac
n.
1.(动植物组织中的)液囊
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Sac
n.
1.美国索克族印第安人
2.索克语
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yolk stopper
【医】 卵黄栓
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heart sac
心包
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cul de sac
n. 袋死巷,死路,困境,死胡同
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culs de sac
(cul-de-sac的复数)
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tooth sac
【医】 牙囊
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