機器
abstract
aged
background
bolt
brown
close
closeup
concept
connection
construction
corrosion
decay
design
detail
dirty
element
flange
grunge
head
industrial
industry
iron
macro
material
metal
metallic
nut
object
old
oldage
one
pattern
rough
rust
rusted
rusting
rusty
screw
sheet
solid
spiral
steel
surface
technology
texture
textured
vintage
weathered
worn