In the past 50 years, the average life expectancy of a registered population in a city has increased by 38 years, reaching 82 years, the highest level in the country. At the same time, the overall morbidity and mortality of malignant tumors in the city have also increased year by year.2 / 3-3 / 4 of developed countries and regions. It is at a medium level worldwide and at a high level across the country. From this we can infer:. ["t present, the city's treatment level for malignant tumors is the highest in the country.", 'the overall morbidity and mortality of malignant tumors in this city are actually lower than those in developed countries in Europe and America.', 'The overall morbidity and mortality of malignant tumors in the city has increased year by year, but such diseases are not the main cause of death in the current population of the city.', "If the incidence of the main diseases that caused the death of the city's population 50 years ago is not currently reduced, then the level of treatment of these diseases must have improved in 50 years."]