Why does China check the epidemic like this?

In order to protect people's life and health, China has a population of1400 million, which is a populous country. If you lie flat, once the virus invades, it will cause large-scale spread in a short time. The expansion of infection scale will bring unprecedented pressure to the medical environment in China. First, it will threaten people's lives, and second, it will lose more manpower, financial resources and material resources. Looking back at the early outbreak at the end of 20 19, you can know. Therefore, for epidemic prevention and control, we must adhere to the zero eradication policy and not "lie flat". Therefore, the epidemic situation in China must be strictly controlled.