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fresh water(49)
surface water(48)
lakes(25)
rivers(16)
salinity(8)
water resources(8)
seasons(7)
sea water(6)
sediment(6)
water pollution(6)
estuaries(5)
phytoplankton(5)
rain(5)
water quality(5)
ecosystems(4)
algae(3)
bacteria(3)
biodiversity(3)
china(3)
cyanobacteria(3)
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