population gravity center 人口重心
population gravity model 人口重力模型
movement of population gravity center 人口重心迁移
population center of gravity 人口重心
·2,447,543篇论文数据，部分数据来源于NoteExpress
Population gravity center and geometric gravity centre have a significant offset, and the trend of deviation from geometric gravity centre is going on.
人口分布重心向东偏离空间几何重心，且有进一步向东偏离的趋势。
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Certainly sustained economic growth, low density and more affordable housing all clearly continue to push the center of population gravity toward certain Sun Belt cities, primarily in the Southeast and Texas.
FORBES: America's Fastest- and Slowest-Growing Cities
Problems whose gravity is enough to produce near consensus among the population cannot seem to find a solution in Congress.
CNN: How strong, really, is America?
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