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农药是一种特殊的商品,是农民用来防治病虫草害的一种商品,因此它的需求量很大程度上取决于病虫草害发生的严重程度,因此它的总需求在没有病虫
Pesticide is a kind of special commodity which is a kind of commodity used by peasants to control pests and diseases. Therefore, its demand greatly depends on the seriousness of pests and diseases, so its total demand is in the absence of pests