機器
automotive
car
change gear
change gearbox
closeup
cog
cogweel
cogwheel
connect
connection
detail
development
engine
engineering
equipment
factory
gear
gear case
gearbox
gearing
industrial
industry
interlock
iron
machinery
manufacture
manufacturing
mechanical
mechanism
metal
metallic
motor
part
pinion
precision
production
reductor
repair
rotate
speed box
steel
technology
teeth
toothed
transmission
turning
wheel
work