機器
ancient
background
catenation
circle
cog
cogs
cogwheel
concept
device
energy
engine
gear
gears
industrial
industry
iron
junction
linkage
machinery
mechanic
mechanical
mechanics
mechanism
movement
pinion
power
precise
precision
rotary
rotate
round
rusty
sprocket
steel
still
team
technical
technology
time
timing
tools
tooth
toothed
transmission
turn
turning
vintage
wheel
work