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surface water(45)
water quality(37)
water pollution(22)
rivers(17)
lakes(16)
water resources(10)
seasons(8)
fresh water(6)
ecosystems(4)
nitrates(4)
phytoplankton(4)
pollution(4)
turbidity(4)
water columns(4)
algae(3)
china(3)
cyanobacteria(3)
fertilizers(3)
pollutants(3)
salinity(3)
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