Inthesummerof1978anEnglishfarmerwasdrivinghistractorth...
問題詳情： Inthesummerof1978anEnglishfarmerwasdrivinghistractorthroughafieldofwheatwhenhediscoveredthatsomeofhiswheatwaslyingflatontheground.Theflattened(變平的)wheatformedacircleaboutsixmetersacross.A...