英文關鍵字
animation
arm
background
bicycle
bike
cartoon
chain
circle
cog
cogwheel
component
cycle
cycling
design
drive
engine
equipment
gear
gearing
graphic
group
icon
isolated
mechanic
mechanical
metallic
motion
part
pinion
power
race
recreation
round
speed
sport
sprocket
steel
strength
style
symbol
symmetry
technology
toothed
traction
transmission
transportation
wheel
white