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为了实现消灭脊髓灰质炎（脊灰）的目标，我市自1991年12月至1993年3月按省厅方案对3岁以下儿童进行3轮的强化免疫。从1993年12月至1997年1月按全国的方案分别对4岁以下儿童开展了4次10轮的强化免疫日（NIDs）活动，（其中1994年按省厅的要求分别在9月和10月份增加2轮）。为了?
In order to achieve the goal of eradicating poliomyelitis (polio), the municipality has conducted three rounds of immunization against children under 3 years old from December 1991 to March 1993 according to the ministry’s scheme. From December 1993 to January 1997, four rounds of 10 NIDs were conducted for children under 4 in accordance with the national program, respectively (of which 1994 and 10 were requested by the provincial government in September and October respectively Month increase of 2 rounds). in order to?