A few days ago，When asked when Chinese people will be able to travel more freely，Zhong Nanshan, academician of the Chinese Academy of Engineering, told CGTN reporter ，“Total estimate，Should be around the end of next year。”Academician Zhong said，This depends on the joint efforts of the whole world——Promote vaccination work around the world, especially in developing countries、Improve the protective effect of vaccines against Delta and other mutant viruses、Inject the third booster shot, etc.。（CGTN）