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哺乳动物 哺乳动物是一大类温血脊椎动物，雌性有乳腺，有一个胸腔隔膜和一个四腔心脏。本类包括鲸鱼、食肉动物、老鼠、蝙蝠、灵长类等。 bǔ rǔ dòng wù
environ.	sesalec

哺乳动物: 5 phrases in 1 subject

Environment

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