Usually the use of three-phase induction motor (with three pairs of poles).

通常多采用三相感应电动机(具有三对磁极)。

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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。

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Last year K2 sold 70, 000 pairs of poles, packaging them with its skis, double what they peddled in 2003.

FORBES: Ski, Fish And Pitch