英文關鍵字
close
cog
cycle
detail
drives
engine
gear
gearbox
gears
loop
machine
mechanical
motor
rotate
rubber
sound
transmission
wooden
workshop
英文關鍵字
close
cog
cycle
detail
drives
engine
gear
gearbox
gears
loop
machine
mechanical
motor
rotate
rubber
sound
transmission
wooden
workshop