If the mercury content in the sewage discharged into the river is too high, then this mercury will be absorbed by the algae and other plankton in the river; these plankton are eaten by the fish, and the mercury will be accumulated in the fish. This fish can cause mercury poisoning. From this we can infer:. ["To eliminate mercury poisoning, don't eat fish.", "To eliminate mercury poisoning, don't eat fish in the river.", 'To eliminate mercury poisoning, dumping of garbage into rivers must be prohibited.', 'To eliminate mercury poisoning, excess mercury in river water must be eliminated.']