N-VAR
(疾病等的)发生，发生率
The incidence of something bad, such as a disease, is the frequency with which it occurs, or the occasions when it occurs.
例句
The incidence of breast cancer increases with age.
乳腺癌的发病率随年龄增长而递增。
...the high incidence of child mortality.
儿童高死亡率