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The emergence of micro and nano robots has promoted the development of precision medicine. These miniaturized robots, built through self-assembly, electron beam deposition and 3D printing, can initiate chemical reactions or move in response to external fields such as ultrasound, light and magnetic fields, as well as microbes (cells). They have a wide range of uses in biomedicine, enabling precise cargo delivery by loading drug particles, biological reagents and living cells. It can also be used as a small surgical tool for surgery, treatment of diseases; It can also detect metal ions and other substances in living organisms to do a good job of early diagnosis of disease; In addition, it can also perform medical imaging by different methods such as photoacoustic and magnetic resonance.