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单词 Mammalia
释义 Mammalia
[mǝ`māl·yǝ]
VERTEBRATE ZOOLOGY
A large class of warm-blooded vertebrates containing animals characterized by mammary glands, a body covering of hair, three ossicles in the middle ear, a muscular diaphragm separating the thoracic and abdominal cavities, red blood cells without nuclei, and embryonic development in the allantois and amnion.
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