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玉环县是浙江省沿海的一个海岛县，１９８９～１９９５年设３０个乡，１９９５年合并为１２个乡。全县人口３８－５万，６１％的居民住在玉环本岛和周围海岛上。全县自１９８５年起实施计划免疫，推行按月接种制度，至１９８９年四苗接种率达到８５％以上。１９８９年起每年进
Yuhuan County is an island county along the coast of Zhejiang Province. From 1989 to 1995, 30 townships were established. In 1995, it was merged into 12 townships. The population of 38-50000, 61% of residents live in Yuhuan Island and the surrounding islands. The county since 1985 plan to implement immunization, the monthly vaccination system, to 1989, four seedlings vaccination rate reached 85%. From 1989 onwards every year