北方土石山区
earth-rock mountainous area
Rocky mountain areas of northern China
华北土石山区
Mountainous area in north China
rocky mountainous area of North China
Rocky mountain areas of northern China
rocky mountain area of northern China
Mountain and stony area
冀北土石山区
northern mountainous area of Hebei Province
土石山区
earth rocky mountain areas
Earth and rocky area
mountainous area
earth-rocky mountainous area
Earth-rock mountain region
Loess bill area
二灰碎石土底基层
lime fly-ash gravelly soil sub-base
加筋碎石土
reinforced cushion gravel
建筑用卵石、碎石
Pebble and crushed stone for building
水泥稳定碎石土
cement stabilized macadam soil