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- 問題詳情：Trafficproblemsareaneverydayconcerninmanycities，includingWashington，DC．AgrowingnumberofWashingtoniansareturningtobicyclestogettoandfromwork．Infact，thenumberofcommuterswhousebicycleshasdoubledinthecitysince2007．RalphBuehlerteachesurbanplanningattheV...
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