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An order of hooved mammals of the subclass Eutheria (including pigs and peccaries and hippopotami and members of the suborder Ruminantia) having an even number of functional toes. 有蹄哺乳动物的一目,属于真兽亚纲(包含猪、野猪、河马和反刍亚目的成员),功能脚趾为偶数。