Human activity is one of the main factors causing geological hazard.

人类活动是导致地质灾害发生的主要因素之一。

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Geological background which is one of the main factors affecting indoor radon.

其中地质背景是影响室内氡的主要因素之一。

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Fuel is one of the main factors determining the future of the motor industry and the quality of life in a specific country.

燃料是决定汽车产业未来的一个主要因素，在某个特定国家甚至决定人们的生活质量。

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Their rivalry has been seen as one of the main factors hindering peace efforts in Afghanistan.

BBC: Pakistan and Iran agree Afghan effort

One of the main factors identified in this research is low levels of the neurotransmitter serotonin.

FORBES: Man Allegedly Strikes Toddler on Airplane: What Was He Thinking?

They are considered one of the main factors that helped reduce violence in the country over the past two years.

CNN: Bombers kill dozens in Iraq