英文關鍵字
19th
20th
ash
black
body
boiler
burning
carry
century
chamber
charcoal
coal
combustion
damper
dirty
durable
duty
engine
engineer
fire
flame
furnace
heat
heavy
history
hot
loaded
locomotive
machinist
maintain
metal
museum
old
open
plant
power
powerful
pressure
pull
railroad
smoke
steam
train
vintage
work