Those were indeed dire heat waves, contributing to the Dust Bowl, which dislocated millions of Americans and changed the population structure of the United States.
这些可怕的热浪造成干旱尘暴，使上百万的美国人迁移并改变了美国的人口结构。
2
The 7 common factors which come from factor analysis almost consisted with theoretic structure, and the contributing rate of cumulative sums of squares was 66.03%.
因为分析产生的7个公因子与理论结构基本一致，累积方差贡献率为66.03%。
3
Land supply and the structure of house supply are the two factors contributing to the disequilibrium between supply and demand.