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周锡瑞

上千年的沉积孕育了肥沃的土地,使得该地区成为中国最重要的农业产区之一。但是,如此平坦的平原,使得排水成为一个相当大的问题;哪个地方的水不能被轻易地排走,哪个地方的土壤就会盐碱化,庄稼就要稀疏

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