英文關鍵字
aggression
aircraft
alien
anti
attack
battleship
combat
cyborg
drone
exploration
extraterrestrial
fantasy
fiction
flying
future
futuristic
gravity
intergalactic
interplanetary
interstellar
invaders
invasion
metallic
military
mothership
mystery
navigation
object
propulsion
robot
saucer
sci
science
ship
shuttle
space
spacecraft
spaceship
starship
technology
the
transport
ufo
unidentified
vehicle
visionary
visitor
war
weapon
worlds