- The karst depression belongs to the accumulative area of surface water and subdrainage area of subsurface water, the karstification is relatively week, and reservoirs are undeveloped.
- The coal washability is controlled by coal accumulating area.
- Rich hydrocarbon accumulation area is usually associated with structure-lithology trap, fault trap and lentoid sand trap.
- He steered into the parking area.
- The slum area was sordid and filthy beyond belief.