природна перешкода
develop a natural obstacle
natural and man-made
natural concealment
natural disaster
natural features
natural forward position
natural respiratory pause
natural background radiation
natural dangerous factors
surveillance by natural vision
compressed natural gas (fuel) (CNG)
antiboat obstacle
antipersonnel obstacle
antipersonnel obstacle breaching system (APOBS)
antitank obstacle
antivehicular obstacle
artificial obstacle
barbed wire obstacle
beach obstacle
composite obstacle
concrete obstacle
demolish an obstacle
incendiary obstacle
log obstacle
man-made obstacle
mine obstacle
obstacle belt/ course
obstacle development
obstacle race
obstacle(s)
parachute obstacle
passive obstacle