Urban sewage treatment ponds图片
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版权：共享素材 
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The city water plant under the blue sky and white clouds
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Urban sewage treatment ponds
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Blue and white clouds and ancient buildings
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Blue and white clouds and tall buildings
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Buildings and blue and white clouds
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The waterworks under the blue and white clouds
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Blue and white sky clouds
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Building visual effects and blue and white clouds
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The building on the blue sky and white clouds
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Blue and white sky clouds
