中胚层

例句：

1. 1. The embryonic development of the human body is divided into three main layers: the epidermis,the dermis, and the ectoderm.
   人体的胚胎发育分为三层：表皮、真皮和外皮。
2. 2.In the study of stem cells, researchers are exploring the potential of using mesoderm-derived cells for tissue engineering.
   在干细胞研究中，研究人员正在探索使用中胚层来源的细胞进行组织工程的可能性。
3. 3. During embryonic development, the mesoderm layer is responsible for forming the limbs and other body parts.
   在胚胎发育过程中，中胚层负责形成四肢和其他身体部分。