Many species have a pouch (marsupium), a fold of skin covering the nipples on the mother's lower belly, where the young continue their development.
品种都有一个
儿袋（marsupium），是在母体下
盖住乳头的皮袋，幼体在袋内继续
。
幼袋Many species have a pouch (marsupium), a fold of skin covering the nipples on the mother's lower belly, where the young continue their development.
品种都有一个儿袋（marsupium），是在母体下盖住乳头的皮袋，幼体在袋内继续。
明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若
现问题，欢迎向我们指正。
