哺乳類 (traditional, jyutping bou6 yu5 leoi6, Yale bou6 yu5 leui6, simplified 哺乳类)
哺乳類 (hiragana ほにゅうるい, romaji honyūrui)
哺乳類 (traditional, Pinyin bǔrǔlèi, simplified 哺乳类)
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