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Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods....
问题详情:Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods.LiBing,togetherwithhisson,decidedtoconstructanirrigationsystemontheMinjiangRiver____41____ (prevent)flooding. ___42___havingalongstudya...