英文關鍵字
abstract
architecture
background
building
bundle
cement
closeup
coil
concrete
construct
construction
corrosion
engineering
equipment
factory
gray
grey
group
heap
heavy
industrial
industry
iron
lines
links
manufacturing
material
metal
nobody
objects
panning
pattern
pile
pole
power
rail
rebar
reinforcement
rough
rusty
shop
slabs
stack
steel
strength
texture
warehouse
wire