UNICEF and WHO have collaborated in an immunization programme, which has been one of the most successful development programmes ever introduced in its ability to significantly reduce infant and child mortality rates.
57．儿童基金会和卫生组织在免疫方案中开展了合作，这是迄今该组织最成功的发展方案，大幅度降低了婴儿和孕妇死亡率。