exophelloderm

例句：

1. 1. The embryonic disc is the outermost layer of the developing organism.
   胚胎盘是发育中的生物体最外层。
2. 2. The skin is made up of three layers: the epidermis, dermis, and subcutaneous tissue.
   皮肤由三层组成：表皮、真皮和皮下组织。
3. 3. The exophelloderm layer is responsible for protecting the underlying tissues from external damage.
   外胚层负责保护下面的组织免受外部损伤。