pēi / tāi / xué / kè / chéng / jiè / shào / le / nèi / pēi / céng / zhōng / pēi / céng / hé / wài / pēi / céng / de / xíng / chéng胚胎学课程介绍了内胚层、 中胚层和外胚层的形成。The embryology course covered the formation of the endoderm, mesoderm, and ectoderm.