英语词汇“yolk sac”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

单词	yolk sac
释义	yolk sac n. A membranous sac attached to the embryo and enclosing the yolk in egg-laying vertebrates. In humans and other placental mammals, it functions as the circulatory system for the embryo before internal circulation begins.
随便看	persecution persecutional persecutive persecutor persecutory Perseid Persephone Persepolis Perseus perseverance perseverate perseveration perseverative persevere perseveringly Pershing Persia Persia Persian Persian Gulf Persian Gulf War Persian lamb Persian lime Persian melon Persian walnut

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