機器
cast iron
cog
cogs
cogwheel
drive
engineer
engineering
fly wheel
flywheel
gear
gears
industrial
industry
linkage
machine parts
machinery
mechanic
mechanical
mechanical parts
parts
pitch
pot metal
power train
precise
precision
spare
spare parts
sprocket
sprocket teeth
sprocket tooth
sprockets
steel
technology
teeth
tooth
tooth pitch
toothed sprocket
transmission
transmission parts
wheel