研究人员认为，廉价食品的广泛供应是主要驱动力之一。
Researchers believe wide availability of cheap food is one of the main drivers.
研究发现，土地退化的主要驱动力是不良的土地管理。
The study found that degradation is being driven mainly by poor land management.
产出方面，第二季度服务部门是经济增长的主要驱动力。
In output terms, the service sector was the main driver of economic growth in the second quarter.
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