英文關鍵字
abstract
circle
close
closeup
construction
cylinder
durable
elements
engineering
equipment
factory
ferrous
gray
group
heap
heavy
indoors
industrial
industry
iron
joist
manufacture
material
metal
metallic
new
objects
pattern
pipe
pipeline
plant
profile
rectangle
rectangular
rod
row
shape
square
stack
steel
stock
structure
texture
tube
tubing
warehouse