海牛目的一种海洋哺乳动物,包括海牛和儒艮,特征为前肢大而无后肢。
sirenians — plural of sirenian
海牛目的一种海洋哺乳动物,包括海牛和儒艮,特征为前肢大而无后肢。
A marine mammal of the order Sirenia, including the manatee and dugong, characterized by large forelimbs with no hind limbs.
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