Genetically engineering humans to regenerate broken limbs and organs is an extremely complex and cutting-edge scientific problem. At present, the scientific community is still conducting in-depth research on the mechanisms of biological regeneration, but there are some potential methods that may provide solutions in the future: 1. **Gene editing technology**: Using tools such as CRISPR-Cas9, genes related to regeneration ability can theoretically be modified. Scientists can study organisms such as salamanders that are known to be able to regenerate limbs, find their regeneration genes, and try to activate similar genes in humans. 2. **Stem cell research**: Stem cells have the potential to differentiate into multiple cell types. By culturing and transplanting pluripotent stem cells or induced pluripotent stem cells (iPSCs), it is possible to regenerate specific tissues or organs at the site of injury. 3. **Tissue engineering and bioscaffolds**: Combined with 3D printing technology, scientists can create bioscaffolds to support cell growth and tissue regeneration. Using the patient's own cells for growth can reduce rejection reactions. 4. **Signal molecules and growth factors**: Studies have found that certain signal molecules and growth factors play an important role in the regeneration process. By regulating these molecules, tissue regeneration can be promoted. 5. **Simulation and research of regenerative mechanisms**: By studying animals that can regenerate naturally, we can understand the molecular and genetic basis of their regeneration and try to simulate these mechanisms in the human body. Although these methods are very promising, their practical application still faces many challenges, including safety, ethical issues and technical feasibility. Most of the current research is in the experimental stage and is still some distance away from the successful regeneration of complex organs in humans. However, with the advancement of technology, human body repair with regenerative ability may become a reality in the future.