Shuangge Wen (SW): The test and trace systems in operation in many countries are a key strategy to lower the reproduction rate and control the virus, with technology enabling measures such as tracing of close contacts, notifying local alerts, and venue check-ins using QR codes. From your technological expertise, how do you see these systems working, and do you see any alternatives which should be explored?

中文翻译：

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流行病应对技术的一些道德、法律和社会层面


文双革（SW）：许多国家正在运行的检测和追踪系统是降低传播率和控制病毒的关键策略，技术支持诸如追踪密切接触者、通知当地警报和场所检查等措施使用二维码。根据您的技术专业知识，您如何看待这些系统的工作原理？您是否认为有任何应该探索的替代方案？