機器
abandoned
aluminum
auto
background
blue
bolt
broken
closeup
compressed
construction
crushed
damage
debris
dump
ecology
environment
garbage
gray
heap
industrial
industry
iron
junk
junkyard
landfill
lot
macro
many
medley
metal
metallic
nut
object
old
pile
recycle
recycling
rubbish
rust
scrap
scrap metal
scrap yard
screw
steel
transportation
trash
waste
wreck
yard