英文關鍵字
apart
background
cable
car
cold
construction
electric
electricity
electrification
electrified
equipment
flight
follow
ice
industrial
industry
line
many
multiple
nature
nobody
parallel
path
pattern
point
rail
railroad
railway
season
sleeper
snow
steel
straight
structure
switch
technology
texture
tie
trace
track
transportation
way
weather
white