機器
aged
ancient
antique
background
circle
clock
closeup
cog
design
detail
device
engine
engineering
equipment
gear
grunge
industrial
industry
iron
machinery
macro
manufacturing
many
mechanical
mechanism
metal
metallic
old
part
pattern
power
production
retro
rivet
rust
rusty
screw
steel
system
technical
technology
texture
textured
tool
turn
vintage
watch
wheel
work