Valley-basin cities usually develop in the area of a valleyterrace with a good location and better conditions of water and land resources.
河谷型大城市是在地理位置较好、水土资源组合条件良好的河谷阶地地带上形成的。
2
The universal cover takes to bring with pleistocene epoch Q3 on the above loess and the valleyterrace the Malan loess and lower part the brand-new world Q4 secondary loess, calls it the new loess.