常见例句双语例句A complex sheet of embryonic cells in craniate vertebrates, formed by association of part of the mesoderm with the ectoderm and developing as the internal body wall.颅骨脊椎动物中一层复杂的胚体细胞，由部分中胚层及外胚层联合组成，形成身体内壁。odict.net 返回 craniate