incidence
/ˈɪnsɪdəns/📚 5922 42 1六级考研托福雅思The incidence of something, especially something bad such as a disease, is the frequency with which it occurs, or the occasions when it occurs. (尤指坏事的) 发生率
noun [专属名词]发生率；入射
The incidence of breast cancer increases with age.
乳腺癌的发病率随着年龄的增长而上升。
in(不， 无) ＋ cid(落下) ＋ ence → 苹果落下砸到牛顿的发生率并非那么高 → 发生率
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