Its primary driving force is fear.

它的主要驱动力是恐惧。

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The primary driving force was a combination of cost, ease of manufacturing and reduced breakage.

正确的选择是：价格、易于制造和减少破坏的结合。

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The strong demand for learning and the aspirations to achieve demand learning are the primary driving force of mobile learning.

人们对学习的强烈需求和实现按需学习的美好愿望是实现移动学习的原生动力。

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The New York Metropolitan Area is the primary force driving development of power markets in New York, Connecticut and New Jersey.

FORBES: Clean Energy Tops Agenda in Connecticut