#VOA常速双语新闻：利用短信帮助儿童疫苗接种 搜索结果
VOA常速双语新闻：利用短信帮助儿童疫苗接种Inaworldof7billionpeople,municationindustryrecordsshowthatnearly6billionofushaveaccesstocellphones.Indevelopingcountries,healthcareworkersinruralareasusemo
