单词measles--mumps--rubella-vaccine
网络: 麻疹腮腺炎风疹疫苗
After the introduction of the combined measles, mumps, rubella vaccine (the MMR vaccine), mumps became much rarer.
在引进麻疹、腮腺炎、风疹联合疫苗(MMR)之后,腮腺炎变得罕见。