During fetal development, the entire body derives from three layers, called germ layers, the ectoderm, mesoderm, and endoderm.

胚胎发育过程由三个胚层组成，分别是：外胚层、中胚层与内胚层。

Mature cystic teratomas are the most common ovarian tumors in young women and usually contain a heterogeneous mix of mature tissues that come from two or three of the germ cell layers.

成熟囊性畸胎瘤是年轻女性中最常见的卵巢肿瘤，内容物常为多种成熟组织的混合物，分别由两个或三个胚层的生殖细胞分化而来。

Now, there are two types of teratomas, the first are mature cystic teratomas, which are the most common ovarian tumors in young women and are formed from tissue that comes from any of the three germ layers.

第1种是成熟的囊性畸胎瘤，是年轻女性中最常见的卵巢肿瘤，由三胚层中的任一层组织形成。