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.
吸烟是导致火灾的主要原因之一。
地理信息的存储是1830年皇家地理学会（RGS）成立的主要原因之一。
The storage of geographical information was one of the main rationales for the foundation of the RGS in 1830.
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