四害密度控制率最高的为蚊，最低的为鼠；
The least reach-mark-ratio of four pests densities was rat density.
纲要里头有一个除四害，就是消灭老鼠、麻雀、苍蝇、蚊子。
There is an article in the programme about doing away with the four pests, that is, wiping out rats, sparrows, flies and mosquitoes.
麻雀，曾为四害，鸟纲雀形目文鸟科麻雀属鸟类的统称，灰头土脸幻想涅槃。
Sparrow, the small wild bird, once denounced one of the Chinese four pests, the general title of the family Passeridae, with ashed apperance dreaming of fantasy nirvana.
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