"drainage"的搜索结果

drainage channel workers

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aerial photo of habitat restoration water drainage

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wetlands drainage pipes

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drainage canal was manually constructed in order to provide a permanent waterway promoting

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drainage canal was constructed in order to provide a permanent waterway promoting the free flow of water

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workers practicing vector control by digging a drainage ditch in order to help disperse standing water

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this drainage canal was undergoing reconstruction in order to provide a permanent waterway

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saltmeadow cordgrass spartina patens watery marsh was traversed by a network of drainage ditches

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install drainage ditches to carry away sewage from the saida neighborhood of karada district in baghdad

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haitian farmer walking by drainage canal in southern haiti

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