英文關鍵字
aircraft
transport
helicopter
flight
motion
air
atmosphere
aviation
outdoors
propeller
fly
nature
high
turbine
weather
daytime
altitude
rescue
height
bright
fast
training
speed
travel
transportation
sky
vibrant
copter
sunlight
help
emergency
energy
security
assist
single
secure
flying
sun
industry
adventure
mission
moving
machinery
overcast
movement