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n.（胚胎）滋养层； 英英释义： trophoblast[ 'trɔfəublɑ:st, 'trəu- ]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
