incidence
[ˈɪnsɪdəns]
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基本释义：n.发生，影响；入射
英英释义：an event , or the rate at which something happens
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| 参考例句：
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- 1. The angle of incidence equals the angle of reflection. 入射角等于反射角。
- 2. The incidence of this disease has dropped considerably in the past few years. 近几年这种病的发病率大大降低了。
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