The gravity model explicitly relates flows between zones to interzonal impedance to travel.
重力模型明确
通过地区间
阻抗来将

和小区联系起来。
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学60秒 2018年12月合集 " Bamboo resources are widely distributed in developing countries participating in the Belt and Road Initiative. China is willing to deepen South-South cooperation through the BRI and contribute solutions to promote sustainable development, " she said.
“竹子资源广泛分布在参与‘一带一路’倡议
发展中国家。中国愿意通过‘一带一路’深化南南合作,为促进可持续发展贡献解决方案。”
综合 Fifteen years have passed since that incident, I am happy to report that my hand is fine. But this question lingers and I continued to be troubled by the unequal distribution of scientific knowledge throughout the world.
距离那个事故发生已经十五年了,我很高兴地告诉你们:我
手现在恢复地很好。不过这个问题在我心里萦绕了很久,我也时常会被
学知识分布
不均衡问题所困扰。