来自incident,偶发事件，发生。引申词义发生率。

1. an area with a high incidence of crime

犯罪率高的地区

来自《权威词典》

2. This area has a high incidence of crime, disease, unemployment, etc.

这个地区的犯罪率 、 发病率 、 失业率等很高.

来自《简明英汉词典》

3. The report analyses the incidence of cancer among people aged 0 - 24.

这份报告分析了从0 岁 到24岁的人的癌症发病率.

来自《简明英汉词典》

4. The change in smoking is paralleled by a change in the incidence of lung cancer.

吸烟情况的变化与肺癌发病率的变化如影随形。

来自柯林斯例句

5. It was noted that within a year the incidence of illness had increased quite significantly.

据观察一年之内发病率显著上升。

来自柯林斯例句