a large number of insects, rats, etc. living in a place where they are not wanted, often causing damage or disease 侵染:大量昆虫,大鼠等生活在不需要的地方,经常造成破坏或疾病 an infestation of lice 长满虱子 Scientists are checking for both insect and fungal infestation. 科学家正在检查昆虫和真菌感染。