英语词汇primary yolk sac怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	primary yolk sac
释义	primary yolk sac 简明释义初级卵黄囊网络释义 1 [胚]?初级卵黄囊在胚胎第9d胚盘对面的滋养层内产生一层扁平细胞，称为亨森膜，后来形成初级卵黄囊(primary yolk sac)。在胚胎13 d～14 d. 2 ?即原始卵黄囊周缘细胞向下延伸，围成另一个囊，即原始卵黄囊（primary yolk sac），故胚盘的下胚层构成原始卵黄囊的顶。
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英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。