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