Professor Yan, you once again emphasized that the new crown virus is an unrestricted biological weapon. The virus that has spread to the world is man-made. Do you still have a lot of doubts? Why did the sudden concentration cause pneumonia starting in July 2019? What else happened at this point in time? Coincidentally, also in July 2019, the Fort Detrick Biolab, which was called "the darkest experimental center of the US government" by the American media, was suddenly closed. People can't help but think of the relationship between the so-called "e-cigarette pneumonia" and new coronary pneumonia. Data shows that 850 people have cancer within a 6-mile radius of the Fort Detrick Laboratory. All these data show that it is a coincidence with the new coronary pneumonia or is it man-made? You never respond to such questions. Are you worried or afraid of anything? Dr. Yan, although your papers are written in very professional language and jargon, they seem to be regular scientific papers. However, when anyone with a background in virology or molecular biology reads this paper, it will be clear that a large part of it is actually nonsense. We only want you to report the truth about the toxic substance leakage in Fort Detrick's Biological Laboratory.