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Letters to Editor: With the global outbreak of COVID 19, many countries are facing various challenges to combat COVID 19, including a shortage of doctors, excessive workload, and the lack of adequate medical protection equipment for frontline health care workers [1, 2], difficulty and inconvenience for residents to see a doctor. Telemedicine plays an important role in fighting viruses [3]. Distance multidisciplinary collaboration and remote mentoring can alleviate the shortage of doctors, especially experts. Avoiding doctors’ unnecessary trips to and from contaminated areas can reduce unnecessary waste of substances such as gowns, and is a viable alternative to alleviating medical shortages. However, the traditional remote guidance mode cannot realize an accurate and real-time guidance communication. While virtual reality is a purely virtual world, augmented reality (AR) can overlap the virtual world with the real …