n.& adj.偶蹄动物（的）
But exactly where hippos sit on the artiodactyl family tree has proved devilishly difficult to discern.
河马也属于偶蹄目,这点专家并无异议,但是它们到底位在偶蹄动物演化树的哪个分支点上,一直都很难定论.
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