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