如果你走访缅茵州海滨城卡姆登市,请找到珍珠街,带上卷尺,从头到尾走一遍,仔细看看量量.一组卡姆登市居民在1991年就是这样做的.当时他们正在制定区划条例.在提出标准之前,他们走了珍珠街的四个街段和城里十来条其它的街道.他们的目标:找出建造可居性街道的要素是什么. If you visit Camden City, the coastal city of Maine in Maine, please find Pearl Street, take a tape measure and walk through it from beginning to end to take a closer look at the quantity. A group of Camden residents did so in 1991. They are making zoning regulations. Before the standard was proposed, they took four blocks of Pearl Street and ten other streets in the city. Their goal was to find out what elements were used to build habitable streets.