機器
aluminum
assembly
auto
automobile
background
bolt
dark
dirty
electronic
engine
environment
equipment
factory
garage
garbage
gears
grunge
hdr
industrial
industry
iron
junk
junkyard
knot
material
mechanic
metal
metallic
motor
nail
nut
old
part
pile
recycle
remnant
rubbish
rust
rusty
scrap
screw
screwdriver
spares
steel
tool
trash
used
washer