Yǒudàilèi dòngwù de yòuzǎi zài mǔqīn de yù'érdài zhōng wánchéng fāyù.
Marsupial young complete their development inside the mother's pouch.
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Break it down: 有 (have) + 袋 (pouch) + 类 (kind/class) + 动物 (animal) — 'pouch-having class of animals'. A transparent, literal translation of 'marsupial' that doubles as a description of the group.