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population(12)
rural areas(8)
urban areas(7)
public health(5)
precipitation(4)
surface water(4)
carbon(3)
conservation(3)
density(3)
humidity(3)
vegetation(3)
drought(2)
fertilizers(2)
lakes(2)
lead(2)
loess(2)
metals(2)
nitrogen(2)
organic carbon(2)
water quality(2)
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