英文關鍵字
furnace
heating
steel
welding
molten
iron
metal
blacksmith
heat
manufacturing
glass
machine
metallic
machinery
flame
manufacture
craft
fuel
factory
hot
heavy
equipment
industrial
material
automobile
gas
engineering
working
hard
smoke
pipe
sparks
forge
production
tool
vehicle
indoors
gear
blast
transportation
work
dust
construction
tools
mechanic
electric
oil
technology
blaze