医疗社会保险制度,从本质上说,是一种在医疗服务和用药付费方面的互助互济的制度。因为相比不生病的人,生病的人总是少数。从一段较长的时间去观察,生病的人所占的比重可能近似于一个常数,他们所患病的种类也有规律 Medical social insurance system, by its nature, is a system of mutual aid and mutual aid in the field of medical service and drug payment. Because compared to people who are not sick, sick people are always a minority. From a longer period of time to observe, the proportion of sick people may be similar to a constant, they also have a regular pattern of illness