本课程所选出的各种国家战略，受到了哪些循环因素的影响？
What recurring factors have exerted the greatest influence on the strategies of the states selected for study?
产生这种循环的因素有两个：食用植物和食肉动物。
Two factors appear to be generating the cycle: food plants and predators.
在保证易腐食品的冷藏运输时，空气循环是最重要的因素之一。
Air circulation is one of the most important factors in protecting refrigerated loads of perishable foods.
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