Does the bullet train need a nucleic acid test report?

See where you come from and where you are going. If it is a low-risk place, it is not necessary to go to a low-risk place. But if you go to a medium-high risk place, or go from these places, you will. In addition, I would like to ask if I need to check the test report when I arrive. You must test it if you want it. This is also very important. So ask in advance, otherwise it's really inconvenient.