機器
abstract
aged
background
bolt
brown
circle
closeup
construction
corrosion
decay
detail
dirty
element
grunge
head
industrial
industry
iron
ironworks
material
mechanic
metal
nut
object
old
oxidation
pattern
rough
rust
rusted
rusty
screw
steel
strength
structure
surface
texture
textured
threads
tighten
vintage
weathered
worn