In theory, scientists can indeed synthesize brand-new virus strains that do not exist in nature through bioengineering. This involves genetic engineering, synthetic biology and other technologies, which can be achieved by recombining the existing virus genome, changing the functional characteristics of the virus, or synthesizing gene sequences from scratch. However, this kind of research: - Subject to strict biosafety supervision and ethical review - Usually conducted in a highly secure laboratory (BSL-3 or BSL-4) -Need to follow the dual-purpose research (DURC) ethical guidelines This technology has both potential medical value (such as vaccine development and understanding of virus function) and biosafety risks. Therefore, the scientific community has strict control measures and international consensus for such research to ensure a balance between scientific exploration and public safety.