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.

许多品种都有一个（marsupium），是在母体下盖住乳头的，体在内继续发。

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.

许多品种都有一个育儿袋（marsupium），是在母体下盖住乳头的皮袋，幼体在袋内继续发育。

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.

许多品种都有一（marsupium），是在母下盖住乳头的皮，在内继续发。

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.

许多品种都有一个育儿袋（marsupium），是在母体下盖住乳头的皮袋，幼体在袋内继续发育。

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.

许多品种有个育儿（marsupium），是母体下盖住乳头的皮，幼体继续发育。

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.

许多品种都有一个育儿袋（marsupium），是在母体下盖住乳头的皮袋，幼体在袋内继续发育。

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.

许多品种都有一个（marsupium），是在母体下盖住乳头的，体在内继续发。

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.

许多有一个育儿袋（marsupium），是在母体下盖住乳头的皮袋，幼体在袋发育。

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.

许多品种都有一个育儿袋（marsupium），是在头的皮袋，幼在袋内继续发育。