incidence /ˈinsidəns/ n. (常用the)发生率：Disease has a high rate of incidence. 发病率高。［考句］At present, it is not possible to confirm or to refute the suggestion that there is a causal relationship between the amount of fat we eat and the incidence of heart attacks.如今对脂肪的吸入量与心脏病的发作率之间具有因果关系的意见既不能确定也不能驳倒。
incident /ˈinsidənt/ n.［c］1. 小事件：an ordinary incident一件普通小事 ［考句］Arriving home, the boy told his parents about all the incidents which occurred in his dormitory. 到家后，男孩就把发生在宿舍里所有的小故事告诉给双亲。2. (小说，戏剧中的)插曲：That was one of the most interesting incidents in the story.那是小说中最有趣的一段。 3.事件，事变：the July 7th incident of 1937 1937年七七事变
