機器
abstract
aging
aircraft
aluminum
ancient
auto
background
blade
board
boat
bolt
car
crack
edge
fence
flange
flatness
grunge
harsh
iron
metal
nail
old
oxidation
paint
paling
palisade
patch
piece
pin
plane
plate
retro
rivet
rough
rust
scratch
screw
seam
spike
spot
stain
steel
texture
tinplate
uneven
vehicle
vintage
wall