The prevalence rate of CHD for middle and old people in countryside of Liaoning was 3.64%,and the standardized prevalence rate was 3.58%.是什么意思_The prevalence rate of CHD for middle and old people in countryside of Liaoning was 3.64%,and the standardized prevalence rate was 3.58%.在线翻译_英语_读音_用法_例句