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害虫感染
environ.	pest infestation 1. The occurrence of one or more pest species in an area or location where their numbers and impact are currently or potentially at intolerable levels. 2. A sudden increase in destructiveness or population numbers of a pest species in a given area (1. 在一个或多个位置发现一个或多个害虫种类，它们的数量正在或可能达到无法忍受的水平。2.在某个地区，破坏性害虫种类的数量突然增加。)