機器
ancient
barb
carving
claw
clockwork
close up
cobweb
cog
cogwheel
connecting
development
device
dust
dusty
engine
gear
gearing
gray
helical
helix
iron
machinery
macro
mechanic
mechanism
metal
metallic
motion
notch
old
paint
painted
pinion
pinion gear
platen
prong
retro
roll
screw
screw drive
screw thread
spiderweb
technology
thread
tooth
toothed
transmission
wheel
wood