英文關鍵字
alloy
background
black
circles
coil
cold
construction
diagonal
fabrication
factory
galvanization
galvanize
gray
grid
hard
heavy
industrial
industry
iron
ironworks
manufacturing
material
metal
metallic
metalwork
nickel
pattern
plant
plate
processed
production
raw
ready
roll
round
seamless
shaped
sheet
silver
stack
stacked
stainless
steel
stock
storage
surface
tin
white
zinc