The four vaccines immunization coverage rate among children of 1 to 6 years old was 66.4% and the coverage rate of HB vaccine was 62.9%.是什么意思_The four vaccines immunization coverage rate among children of 1 to 6 years old was 66.4% and the coverage rate of HB vaccine was 62.9%.在线翻译_英语_读音_用法_例句