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过去人们用人粪和草肥等天然肥料给农作物施肥,如今却用化肥和农药,于是农作物中便有了损害人体健康的物质,甚至导致各种疾病。
In the past, people used fertilizers such as manure and grass to fertilize crops. Now they use chemical fertilizers and pesticides. So they have substances that harm human health and even cause various diseases.