An assortment of chemicals, such as DDT, have been employed since early in the last century to control crop pests or carriers of diseases.
一种化学药品，比如滴滴涕（DDT，一种杀虫剂，在环境中非常难降解，多数国家已经明令禁止或限制生产和使用DDT），从上个世纪早期以来一直被用于控制农作物虫害或者疾病载体。
An assortment of chemicals, such as DDT, have been employed since early in the last century to control crop pests or carriers of diseases.
一种化学药品，比如滴滴涕（DDT，一种杀虫剂，在环境中非常难降解，多数国家已经明令禁止或限制生产和使用DDT），从上个世纪早期以来一直被用于控制农作物虫害或者疾病载体。
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