If you recall the flood epidemic that hit Colorado State University just a couple summers ago, that natural disaster wreaked havoc all over campus.
你是否还记得几年前袭击科罗拉多州立大学的那场洪水，这场自然灾害使整个校园遭殃。
Catastrophes such as fire, flood, drought or epidemic may reduce population sizes to a small fraction of their average level.
火灾，洪水，干旱或流行病可能减少种群数量到他们平均水平的一小部分。
Rainfall and flood types were the main epidemic forms.
流行形式主要是雨水型，次为洪水型。
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