Before revision:  The most successful containment policyreaches the lowest s factor, the characteristic time of the exponential growing doubling time in the arrested regime . South Korea, China, Italy and USA have reacheds= 5 , 6, 10, 18 respectively.
After revision:  The most successful containment policyreaches the lowest s factor, the characteristic time of the exponential growing Td(t) in the arrested regime . South Korea, China, Italy and USA have reacheds= 5 , 6, 10, 18 respectively.