n. the relative frequency of occurrence of something
n. the striking of a light beam on a surface
n. 发生, 发生率, 影响, 负担者, 入射, 倾角
[医] 入射, 发生率, 发生数
1. The incidence of flu cases increases during the winter months.
流感病例的发生率在冬季月份增加。
2. Researchers are studying the incidence of heart disease in young adults.
研究人员正在研究年轻人中心脏病的发生率。
3. There has been a significant decrease in the incidence of traffic accidents this year.
今年交通事故的发生率显著下降。