Incidence of infectious diseases A and B was 301 per 100,000 of the permanent population of Beijing, down by 2.24 percent over the previous year.是什么意思_Incidence of infectious diseases A and B was 301 per 100,000 of the permanent population of Beijing, down by 2.24 percent over the previous year.在线翻译_英语_读音_用法_例句