機器
abstract
aged
assembly
attach
bolt
closeup
connection
construction
corrode
corrosion
damaged
design
detail
dirty
effect
element
equipment
factory
fastener
fragment
grunge
industry
iron
macro
material
mechanical
metal
nut
object
obsolete
old
orange
outside
part
process
red
repair
retro
rust
screw
steel
strong
structure
surface
textured
thread
tool
vintage
weathered