standard mortality ratio

例句：

1. 1. The standard mortalityratio for this disease is 2%.
   这种疾病的标准死亡率为2%。
2. 2. The study foundthat the standard mortality ratio for heart diseasein this region was higher than expected.
   研究发现，该地区心脏病的标准死亡率高于预期。
3. 3. Thestandard mortality ratio for childhood cancer has beendeclining over the past decade.
   过去十年里，儿童癌症的标准死亡率一直在下降。