## 3 Results
The relationship between safe medical resources and the isolation rate of hospitalized severely infected individuals and the evolution results of the number of deaths in regard to medical resources for different isolation rates of severely infected individuals are shown in Figure 5, where the isolation rate of hospitalized mildly infected individuals is 0.1 and 0.4. In Figure 5a, the isolation rate of hospitalized mildly infected individuals is small. When medical resources are insufficient, an increase in the isolation rate of the hospitalized severely infected individuals would have a small influence on the final number of deaths; however, when medical resources are sufficient, the final number of deaths would be strongly influenced by the isolation rate of hospitalized severely infected individuals. The higher the isolation rate of hospitalized severely infected individuals, the fewer the deaths. For different isolation rates of severely infected individuals, there would be different values for safe medical resources to ensure that the number of deaths would not change and the medical resources would not be overwhelmed. As shown in Figure 5b, the value of safe medical resources would increase gradually with the increase in the isolation rate of hospitalized severely infected individuals. However, there would be no significant difference in the value of safe medical resources when the isolation rate of hospitalized severely infected individuals is high. Figure 5c shows that when \(v_{1}=0.4\), the isolation rate of hospitalized severely infected individuals would have a greater impact on the number of deaths, regardless of the value for safe medical resources. In Figure 5d shows that when the isolation rate of hospitalized severely infected individuals is greater than 0.1, the value for safe medical resources would decrease monotonically. The evolution results of the number of deaths in regard to medical resources for different isolation rates of hospitalized mildly infected individuals and the relationship between safe medical resources and the isolation rate of hospitalized mildly infected individuals are shown in Figure 6, where the isolation rate of hospitalized severely infected individuals is 0.1 and 0.6. The results that are presented in Figure 6a,c are relatively similar. When the isolation rate of hospitalized severely infected individuals is fixed at a certain level and when medical resources increase to the value of safe medical resources, the number of deaths would remain stable. Meanwhile, the greater the isolation rate of hospitalized mildly infected individuals, the fewer the deaths. In Figure 6b,d, it can be seen that regardless of whether the isolation rate of hospitalized severely infected individuals is at a low or high level, the value of safe medical resources would decrease with the increase in the isolation rate of hospitalized mildly infected individuals. This conclusion has a strong practical significance, which illustrates the effectiveness of establishing mobile \"cabin\" hospitals to treat mildly infected individuals to inhibit the spread of COVID-19. Figure 5: (**a**) Evolution results of the number of deaths in regard to the medical resources for different isolation rates of hospitalized severely infected individuals when the isolation rate of hospitalized mildly infected individuals is 0.1; (**b**) the relationship between safe medical resources and the isolation rate of hospitalized severely infected individuals when the isolation rate of hospitalized mildly infected individuals is 0.1; (**c**) evolution results of the number of deaths in regard to the medical resources for different isolation rates of hospitalized severely infected individuals when the isolation rate of hospitalized mildly infected individuals is 0.4; (**d**) the relationship between safe medical resources and the isolation rate of hospitalized severely infected individuals when the isolation rate of hospitalized mildly infected individuals is 0.4.