Introduce the basic content and application of Geographic migrationtheory in Demography and Social cost theory in Economics.
介绍了人口社会学中的人口迁移理论和经济学中的社会成本理论的基本内容，以及它们在本文的运用。
2
This paper points out the mistake occurring in studying seismic wave by optical method and analyses the current migrationtheory and methods.
本文指出用物理光学的研究方法来研究地震波时所存在的问题。讨论了目前偏移的理论和方法。
3
Therefore, in animal models to guide the production of migrationtheory is naturally produced in animal models of AIDS should not become the main reason for success.