英文關鍵字
3d
alloy
animation
arrangement
bicycle
bike
cassette
chain
circle
cog
cogwheel
component
connect
connection
cycle
drive
element
equipment
gear
grease
icon
illustration
industrial
industry
iron
isolated
isometric
link
linked
machine
machinery
mechanical
mechanism
metal
metallic
motion
motorcycle
part
pinion
power
reliable
ring
shape
sport
sprocket
steel
strong
technology
transmission
vehicle
wheel