什么是麻疹、腮腺炎和风疹？
If you haven't had measles, mumps or rubella when you were a child, and haven't been vaccinated against them, you can get these diseases when you're older.
MMR代表麻疹、腮腺炎和风疹。
过去麻疹腮腺炎和风疹(也叫德国麻疹)是极常见的儿童疾病。
Measles, mumps, and rubella (also called German measles) used to be quite common childhood diseases.
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