英文關鍵字
copper
crane
dump
dumped
foundry
heap
industrial
industry
iron
junk
junkyard
machine
magnet
metal
metallic
metallurgy
mining
pieces
process
processed
recycling
rolling
scrap
scrapyard
steel
steelmaking
technology
transfer
trash
waste
working
英文關鍵字
copper
crane
dump
dumped
foundry
heap
industrial
industry
iron
junk
junkyard
machine
magnet
metal
metallic
metallurgy
mining
pieces
process
processed
recycling
rolling
scrap
scrapyard
steel
steelmaking
technology
transfer
trash
waste
working