機器
aerially
aerodynamic
air
aircraft
army
aviation
axis
bend
blade
blue
chopper
civil
closeup
cloud
detail
engine
exhaust
flight
fly
flying
four
grey
helicopter
helix
hub
immobile
levitation
main
mechanical
mechanism
military
motor
pale
parts
power
propeller
propulsion
rotor
sails
sky
spin
surface
suspension
takeoff
technology
transport
transportation
up