英文關鍵字
beam
billet
blank
broken
construction
dark
deepening
destruction
engineer
furrow
gauge
heavy
industrial
industry
influence
instrument
iron
joint
material
measuring
metal
metallic
metallurgy
meter
monitoring
process
production
readings
ruler
rusty
scale
scar
specialized
steel
surface
taking
texture
trace
use
using
weld
welded
welding
worker