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... ounties lined up in long queues to conduct pollution value detection.
The pesticides jointly produced by the 1st, 3rd and 7th research institutes have also entered thousands of households. Not to mention silkworms, for a while, there were a lot less flies and mosquitoes in city a.
It's a pity that these insecticides are useless against the flies in city x.
Because of the lack of effective data, the institute still does not know the working principle of the slaughterhouse.
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