- 問題詳情:AsEricHofferoncesaid,“Thehardestarithmetic(算術)tomasteristhatwhichenablesustocountourblessings.”Accordingtoalegend,ayoungmanwhilewanderingaroundthedesertcameacrossaspringofdeliciousclearwater.Thewaterwasso 41 andhefilledhisleathercanteen(水...
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