英文關鍵字
belt
engineering
flywheel
gear
heavy
industrial
large
loop
machine
mechanism
motor
nobody
outdoors
power
pressure
pulley
pump
reduction
rotating
rotation
round
spin
turning
turns
vehicle
vintage
wheel
working
英文關鍵字
belt
engineering
flywheel
gear
heavy
industrial
large
loop
machine
mechanism
motor
nobody
outdoors
power
pressure
pulley
pump
reduction
rotating
rotation
round
spin
turning
turns
vehicle
vintage
wheel
working