transport and machinery
road system, fixed bridges, movable bridges, road signs, service station, automobile, brakes, tire, types of engines, caravan, bus, trucking, motorcycle, bicycle, road tunnel, radiator, battery, spark plug, hybrid automobile, electric automobile, 4 X 4 all-terrain vehicle
types of passenger cars, diesel-electric locomotive, car, railroad track, subway, passenger station, railroad station, high-speed train, yard, highway crossing, streetcar
canal lock, ancient ships, traditional ships, four-masted bark, examples of boats and ships, anchor, navigation devices, maritime signals, maritime buoyage system, harbor, examples of sails, examples of rigs, life-saving equipment
airport, examples of airplanes, examples of helicopters, long-range jet, flight deck, turbofan engine, examples of tail shapes, examples of wing shapes, forces acting on an airplane, movements of an airplane, helicopter
