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安徽省贵池市自1987年以来对全市25个山丘型小环境进行了石砌、水泥护沟等一系列沟渠硬化的改造工程，有效地控制了螺、病情，但其中9个环境点改造后螺情出现反复，个别点甚至出现钉螺面积扩散现象。现根据现场调查情况对各小环境点螺情“复燃”原因进行逐一探讨，为更好地巩固
Since 1987, Guichi City, Anhui Province has carried out a series of renovation of ditches and harms on 25 small hill-shaped environments in the city, effectively controlling spiral and disease conditions, but 9 of them were rebuilt After the spiral appears repeatedly, individual spots even appear Snail area proliferation phenomenon. Now according to the scene of the investigation of the small environment point snail “flare up” one by one to discuss the reasons for better consolidation