1. 传染病：population explosion 人口爆炸 | epidemic disease 传染病 | dropout students 失学儿童
2. 流行病：Enzyme specificity 专特性 | Epidemic disease 流行病 | Epidermal cell 表皮细胞
3. 流行性疾病：measurable adj. 可衡量的 | epidemic disease 流行性疾病 | We find the loss is measurable. 我们发现损失可以估量
4. 流行性传染病：enzyme 酵素/酶 | epidemic disease 流行性传染病 | equator 赤道
noun
1. any infectious disease that develops and spreads rapidly to many people