they do cost 3% to 8% more than conventional buildings,but the higher cost is recovered within two o

题目

they do cost 3% to 8% more than conventional buildings,but the higher cost is recovered within two or three years by the considerable sum of savings in maintenance costs.4563

答案

他们的确比传统建筑造价要高3％到8％.不过两三年内
维修费用上的节省就能把多花的成本省出来.