Having three germlayers. Used of the vertebrate embryo.
三重胚的具有三层原胚层的。
2
Derived from two embryonic germlayers, the ectoderm and the endoderm.
双胚层的具有两个胚层（外胚层和内胚层）的。
3
When an animal develops, embryos form three cellular or germlayers - ectoderm, endoderm and mesoderm - which then go on to form the body's organs and tissues.