单语范例（未经PONS编辑处理）
Loess is the name for the silty sediment that has been deposited by wind storms on the plateau over the ages.
en.wikipedia.org Near the surface, there are loess layers of different thickness.
en.wikipedia.org Soils underlain by loess tend to be excessively drained.
en.wikipedia.org For this, the local soil horizon provides suitable conditions as sediments below the soil layer are made up of loess.
en.wikipedia.org Because of its outstanding loess soils the region is mainly used for arable farming.
en.wikipedia.org