英文關鍵字
alloy
background
beautiful
bright
casting
closeup
converting
copper
danger
down
drain
equipment
factory
fire
floor
flow
flowing
flows
furnace
hot
indoor
industrial
industry
iron
ironworks
job
liquid
manufacturing
melt
melting
metal
metallic
metallurgical
metallurgy
mill
molten
operations
orange
plant
production
smelter
steel
substance
technology
temperature
work
works
workshop