Shortly after implantation the blastocyst wall, the trophoblast, consists of two layers of cells.
植入之后不久,胚囊的壁, 即滋养细胞含有两层细胞.
辞典例句
As the trophoblast shell gradually begins to break open, maternal blood placental lacunae.
由于绒毛细胞外壳逐渐退化开放, 母体血液即涌入绒毛间隙.
互联网
"after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"