機器
against
air
aircraft
airforce
apache
arm
army
assault
attack
aviation
backdrop
blade
chopper
copter
danger
defense
engine
fighting
flight
flights
fly
force
gray
grey
gun
helicopter
hover
industrial
longbow
military
militaryhelicopters
militarytransportation
pilot
propeller
pursuit
rotor
service
ship
show
sky
transport
transportation
vane
vehicle
view
voyage
war
weapon