... secondary ectoderm 后成外胚层 embryonic ectoderm 原始外胚层 two-layered ectoderm 二层外胚层 ...
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The middle embryonic germ layer lying between the ectoderm and the endoderm from which connective tissue muscle bone and the urogenital and circulatory systems develop.
中胚层中间胚芽层，位于外胚层和内胚层之间，最终发育成结缔组织、肌肉、骨骼、泌尿系统及循环系统。
The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop.
中胚层中间胚芽层，位于外胚层和内胚层之间，最终发育成结缔组织、肌肉、。
Derived from two embryonic germ layers, the ectoderm and the endoderm.
双胚层的具有两个胚层（外胚层和内胚层）的。
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