Mammals (formally Mammalia) are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young.
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美
释义
哺乳动物(正式哺乳动物)是一类脊椎动物的名字来自其独特的功能,乳腺增生病,与它们喂养自己的年轻。
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