语言选择:
免费网上英汉字典|3Dict

vitelline sac

资料来源 : WordNet®

vitelline sac
     n : membranous structure that functions as the circulatory
         system in mammal embryos until the heart becomes
         functional [syn: {yolk sac}, {umbilical vesicle}, {vesicula
         umbilicus}]
依字母排序 : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z