英文關鍵字
bright
cast
casting
danger
energy
equipment
factory
fire
flame
foundry
furnace
heat
heavy
hot
industrial
industry
iron
light
liquid
make
making
man
manufacture
manufacturing
melting
metal
metallurgical
metallurgy
mill
molten
orange
pipes
plant
process
production
products
red
rolling
smelting
smoke
spark
sparks
steel
technology
work
worker
workshop
yellow