• 1. population migration: 人口迁移
• 2. Population Migration Model: 人口流动模型
• 3. urban population migration: 城市人口迁移

更多释义

• 1.Study on urban population migration models.
  城镇人口迁移模式研究。
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• 2.It suggests that the population migration economical growth mod - el could interpret regional economical growth differences.
  人口迁移的经济增长模型解释了地区间经济增长差异的原因。
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• 3.These conditions are most prevalent in tropical regions; however population migration has spread these diseases to most countries.
  这些病症在热带地区最为普遍；不过，随着人口迁移，这些疾病已传播到大多数国家。
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