one of the prime reasons
最主要的原因之一 one of the main reasons
当然，侵蚀是造成其破坏的主要原因之一，但人类活动应承担的责任也越来越大。
Erosion, of course, is one of the key reasons for its destruction, but human activity is also increasingly responsible.
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吸烟是导致火灾的主要原因之一。
Smoking is one of the main reasons for fires.
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