不过健康保险是一个相对较新的概念，早在健康保险出现之前，就已经有了医生和医学。
There were doctors and medicine long before there was health insurance.
预防医学旨在提高公共卫生健康水平，预防和控制疾病的发生。
Preventive medicine is to raise the level of public health and prevent and control diseases.
预防医学旨在提高公共卫生健康水平，预防和控制疾病的发生。
Preventive medicine is to raise the level of public health and prevent and control diseases.
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