由于农村地区的年轻人移居城镇，把老年人滞留在农村，农村地区的抚养系数将会比城市的抚养系数上升幅度更大。
In rural areas the dependency ratio will rise far more steeply than in cities as young people move out and the elderly stay behind.
相对孔隙系数值可用以表征聚合物溶液流经孔隙介质时聚合物分子尺寸与滞留作用的关系。
Relative porosity factor value can be used to characterize the relation between the molecular size of the polymer and the its retention in the flow of polymer solution through porous media.
这个系数考虑到了在固体颗粒上吸附的气体，尾涡和乳化相之间的交换以及在这个体系中的滞留量。
This factor accounts for the gas adsorbed on the solids, its interchange between the wake and the emulsion, and its holdback in the system.
这个系数考虑到了在固体颗粒上吸附的气体，尾涡和乳化相之间的交换以及在这个体系中的滞留量。
This factor accounts for the gas adsorbed on the solids, its interchange between the wake and the emulsion, and its holdback in the system.
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