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The elephant is the largest living land mammal哺乳动物.// During evolution,/ its skeleton骨骼 has greatly altered改变 from the usual mammal, designed for two main reasons.// One is to cope with应对 the great weight of huge grinding碾磨的 cheek teeth臼齿,/ making the skull脑壳 particularly massive特别大.// The other is to support the enormous bulk庞大的主体 of such a huge body.