单词	trophoblast
释义	trophoblast noun tro·​pho·​blast ˈtrō-fə-ˌblast  : the outer layer of the mammalian blastocyst that supplies nutrition to the embryo and facilitates implantation trophoblastic ˌtrō-fə-ˈbla-stik  adjective Word History Etymology International Scientific Vocabulary First Known Use 1889, in the meaning defined above Medical Definition trophoblast noun tro·​pho·​blast ˈtrō-fə-ˌblast  : the outer layer of the mammalian blastocyst that supplies nutrition to the embryo, facilitates implantation by eroding away the tissues of the uterus with which it comes in contact allowing the blastocyst to sink into the cavity formed in the uterine wall, and differentiates into the extraembryonic membranes surrounding the embryo called also trophoderm
随便看	cola seed cola tree Colaciales colacobioses colacobiosis colae colander colanders colane colapteses fire brigade fire bush fire chaser fire check fire cherry fire chief fire cock fire company fire control fire coral fire curtain fire cut fire department fire direction fire direction center

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