trophoblast

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.

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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