英文關鍵字
track
transportation
jetliner
trace
pollution
fume
flight
plane
vapor
wing
contrail
direction
cruising
fuselage
blue
sky
fly
aircraft
business
jet
passenger
speed
condensation
airplane
chemtrails
exhaust
aviation
atmosphere
altitude
aeroplane
trail
traffic
journey
engine
international
line
fast
cargo
transport
white
smoke
air
high
fuel
commercial
airliner
travel
flying