Having three germ layers. Used of the vertebrate embryo.
三重胚的具有三层原胚层的。
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。
When an animal develops, embryos form three cellular or germ layers - ectoderm, endoderm and mesoderm - which then go on to form the body's organs and tissues.
当一个生物产生时，胚胎将形成三个胚层外胚层、内胚层和中胚层，然后再由这些胚层形成机体的组织和器官。
When an animal develops, embryos form three cellular or germ layers - ectoderm, endoderm and mesoderm - which then go on to form the body's organs and tissues.
当一个生物产生时，胚胎将形成三个胚层外胚层、内胚层和中胚层，然后再由这些胚层形成机体的组织和器官。
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