The Java virtual machine (JVM) is a program whose sole purpose is to execute other programs. This simple idea has made Java one of the most successful and long-lived platforms of all time.

跨城就医潮：全国70%的优质医疗资源集中在一线城市，异地患者占比超30%。以北京协和医院为例，其门诊患者中40%来自外省，他们对本地流程不熟悉，需专业陪诊协助完成挂号、检查、取药等环节。