资料来源 : pyDict

滋养层; 滋养母细胞

资料来源 : WordNet®

trophoblast
     n : the membrane that forms the wall of the blastocyst in early
         development; aids implantation in the uterine wall;
         "after implantation of the blastocyst in the uterine wall
         the trophoblast divides into two layers, the chorion and
         the placenta"