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国土生态安全
在国家尺度上,生态系统结构合理、功能完善、过程稳定,并能够为人类生存和经济社会发展持续提供良好生态系统服务的状态。
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river engineering
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river floods in China
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River God
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River Huan and Wuxie Scenic and Historic Area
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River La Plata Region People’s Fight of Resistance against Britain
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