The hospital is the place where you can feel life and death the most. As a surgeon, I have witnessed the joy of new life and the helplessness of life slowly passing away. I remember some people say that when a doctor is used to seeing life and death, his heart will become numb. In fact, the so-called numbness is just a kind of "self-protection" emotion in the working state. When the health of one's family and friends has problems, this kind of "self-protection" emotion will collapse more easily than imagined.