Usually the insect eaters are helpful to man, because they do away with harmful insects such as mosquitoes.
吃昆虫的动物通常都有益于人类，因为它们消灭诸如蚊虫之类的害虫。
The cage-typed electric-net insect killer can be used all day long, which can widely trap and kill the crops harmful insects.
这种笼式电网灭虫器 能够全天候使用，更为广泛地引诱触杀农作物有害昆虫。
The monitor insect mouth density may know the harmful insect type which and the insect mouth density in the greenhouse exists.
监测虫口密度可以知晓温室中存在的害虫种类及其虫口密度。
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