Level III Ecoregions of Alaska
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Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. The ecoregions of Alaska are a...
生态区（Ecoregions）指生态系统与环境资源的类型、质量及数量均具有总体相似性的区域。阿拉斯加的生态区为……
