природні об'єкти (місцевості)
Defense Exportability Features (DEF)
man-made features
relief features
construction features
world map of principal aeronautical features
features of synthesis algorithm implementation for reflected signals
implementation features
water features
natural and man-made
natural concealment
natural disaster
natural forward position
natural obstacle
natural respiratory pause
natural background radiation
natural dangerous factors
develop a natural obstacle
surveillance by natural vision
compressed natural gas (fuel) (CNG)