![Inthesummerof1978anEnglishfarmerwasdrivinghistractorth...]( "Inthesummerof1978anEnglishfarmerwasdrivinghistractorth...")
- 問題詳情： Inthesummerof1978anEnglishfarmerwasdrivinghistractorthroughafieldofwheatwhenhediscoveredthatsomeofhiswheatwaslyingflatontheground.Theflattened(變平的)wheatformedacircleaboutsixmetersacross.Aroundthiscirclewerefoursmallercirclesofflattenedwh...
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