yolk sac
参考词典中yolk sac的常规释义：
基本释义
- n.(=yolk bag)[动]卵黄囊
英英解释
2个名词解释
- membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
[同] umbilical vesicle, vesicula umbilicus, vitelline sac, yolk sac - membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
点击查看……- membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
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