英文關鍵字
auto
automobile
background
basis
belt
bolt
car
circle
closeup
component
disassembled
engine
engineering
gear
gearing
gearwheels
industrial
industry
machine
machinery
manual
mechanic
mechanical
mechanism
metal
metallic
part
power
product
pulley
service
spare
steel
surface
technical
technology
trancircle
transfer
transmission
vehicle
wheel
work