但是，这个庞然大物是如何离开极地寒带，来到这个寒温带的地方呢？
How is it possible for the giant bear to leave the polar zone for Kanas, located in cold temperate zone?
为了验证这个想法，科研小组们研究了几对植物的DNA，每一对均由亲缘关系很近的两种植物组成。 而且，其中的一种植物属于热带植物，另一种则属于靠近极地生长的寒带植物。
To test this idea, the team studied the DNA of pairs of closely related plant species in which one member of the pair was tropical and the other was found closer to the poles.
为了验证这个想法，科研小组们研究了几对植物的DNA，每一对均由亲缘关系很近的两种植物组成。 而且，其中的一种植物属于热带植物，另一种则属于靠近极地生长的寒带植物。
To test this idea, the team studied the DNA of pairs of closely related plant species in which one member of the pair was tropical and the other was found closer to the poles.
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