条件筛选
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Whether or not to use pesticides when farming is a dilemma either way. What is the best course of action?
A few days ago I went back to my hometown and made a point of walking along the river outside the town, and by the edge of the fields I found a pile of empty pesticide bottles and bags. I looked it up online, and pyrazosulfuron-ethyl and bispyribac-sodium...