英文關鍵字
airborne
aircraft
army
aviation
defense
flight
flying
gray
helicopter
hovering
maneuver
maneuvers
marine
marines
midair
military
place
practice
practicing
takeoff
transport
transportation
vertical
vertol
英文關鍵字
airborne
aircraft
army
aviation
defense
flight
flying
gray
helicopter
hovering
maneuver
maneuvers
marine
marines
midair
military
place
practice
practicing
takeoff
transport
transportation
vertical
vertol