Parent:My child is healthy . What vaccinations should he have?家长:我的孩子健康,他应该接种什么?医生:今天我要给他注射三联疫苗,一共是3针。Parent:When should I bring him back for the second injec‐tion?医生:今天我给你孩子开了脊髓灰质炎疫苗。这是一粒红色糖丸,是Ⅰ型。Doctor:The pill does not keep at roomtemperature,so you mu ......