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生态屏障
处于某一特定区域,具备完善的生态系统结构、过程与功能,能有效保障区域内外乃至国家生态安全的复合生态系统。
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Yakov Petrovich Polonsky
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Yakutat Bay
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Yale Bright Star Catalogue
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Yalong River Scenic and Historic Area
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Yalta Agreement
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