对未知的恐惧被编造成令人毛骨悚然的故事随之扩散开来，都市传言便一直流传在人群之间。
Urban legends have been around forever, as fear of the unknown gets spun into macabre tales that proliferate with each person who hears them.
科学家通过理解病原体在人群之间的传播可以用复杂的计算机模型来推算其可以传播多少人群。
By understanding how pathogens spread between people, scientists can also extrapolate how it will spread among far larger populations using sophisticated computer models.
虽然，这种疾病可以影响各个年龄段人群，它的首发通常是在35 - 55岁之间。
Although the disease can affect individuals of all ages, its onset usually occurs between the ages of 35 and 55 years.
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