Zhongxin Client, April 10 (Xie Yiguan) On the 10th, the Chinese Academy of Engineering Zhong Nanshan talked online with South Korean epidemic prevention experts regarding the risk of overseas imports. He said that risk must exist, but risk does not mean reality. "Especially people from countries and regions where the epidemic has just occurred and the epidemic has developed rapidly are often more contagious. As long as strict monitoring and tracking are taken, they will be isolated once they are discovered, and close observation of the people he contacts. Under the circumstances, even if a few people are infected, it will not cause an outbreak. "Zhong Nanshan said, there must be foreign input in the future, especially in large cities. It is unrealistic to completely clear it unless it is completely isolated from the world. Control at a lower level.