英文關鍵字
metal
material
industry
industrial
construction
product
beam
pipe
round
bar
square
iron
diamond
plate
tube
angle
symbol
brass
expanded
sheet
channel
manufacturing
profile
safety
grating
steel
stainless
aluminum
copper
perforated
build
durable
girder
manufacture
shape
construct
strong
solid
heavy
pipeline
icon
motion
graphic
animation
pictogram
hd
animated
black
line