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当马铃薯传入欧洲及其他地区种植不久,人们就发现许多地方的马铃薯产量逐年下降,植株变小,甚至发生畸型。人们称这种现象为退化。马铃薯为什么会发生退化?科学家们研究发现,田间马铃薯退
When potatoes were planted in Europe and elsewhere, people found that potato production in many places was declining year by year, with smaller plants and even deformities. People call this phenomenon degenerated. Why the degradation of potatoes? Scientists have found that field potato retreat