On sub-central, marginal zone delineation and analysis, try to summarize the three expansion mode Yan culture, that base-style occupation mode, overlay mode and intrusive occupation mode.
通过对次中心区、边缘区的划分和分析，尝试着总结了燕文化的三种扩张模式，即辐射式据点模式、覆盖式占领模式和侵入式殖民模式。
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