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1.The animal has a desmodactylous foot, which makes it difficult to walk on soft surfaces.
这种动物有蹄足，这使得它在软表面上行走很困难。
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2.The horse has a desmodactylous foot, which is why it can't run very fast.
马有蹄足，这就是为什么它跑不快的原因。
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3.The dog has a desmodactylous foot, which means it can't walk very far without rest.
狗有蹄足，这意味着在没有休息的情况下，它不能走很远。