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(marsupium),是在母下盖住乳头的皮,在内继续发。
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