The old man is in poor health and wants to buy a place with a good environment and a relatively cheap price. If they want a good environment and a relatively cheap price, they have to choose a small city in the third and fourth lines and a place near the mountains and rivers, so that the local environment is quiet and few people are suitable for rest. However, the facilities in this place may be incomplete, such as being far from the hospital. If there is anything, it may not be convenient for treatment.