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

单词	yolk sac
释义	yolk sac noun Zoology 1A membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes.The eggs take about 20 weeks to hatch and the now free-swimming ray is still reliant upon its yolk sac for a few more weeks before it begins to feed upon shrimps.... Likewise, the occasional yolk sac tumor arising in liver has been reported in childhood. The neoplasm metastasized as the yolk sac component. 1.1A sac lacking yolk in the early embryo of a mammal.
随便看	polymorphous perversity polymorph-perverse polymorphy polymyalgia polymyalgia rheumatica polymyarian polymyodian polymyositis polymyxin polynemid Polynesia Polynesian polynesic polyneuritic polyneuritis polyneuropathy polynoid polynom polynome polynomial polynomially polynomial time polynomic polynosic polynuclear

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