If novel coronavirus keep cool from the US, then when the world is early warning, China will be able to be calm and calm.It is China's decisive closure of the city in the face of the epidemic that has delayed the spread of the virus to other regions. At the same time, the inaction of other countries, led by the United States, is the root cause of the growing epidemic in these countries, not to mention the fact that the source of the virus is still unclear. What is the "flu" that swept tens of millions of people in the United States last year is really not clear!