In order to reduce cross-border transmission of Covid-19, starting from November 7th 2020, all Chinese and foreign passengers who are to fly from the Kingdom of Saudi Arabia to China will be required to take nucleic acid and IgM anti-body tests and then apply for a green health code with the "HS" Mark or a certified health declaration form before boarding the flight. The specific requirements are as follows: 　　I. Test Requirements 　　P...