英文關鍵字
aluminum
automated
belt
cable
chain
circle
clean
closeup
component
connections
detail
device
electric
electrical
electricity
energy
engine
engineering
equipment
factory
fast
gear
gray
industrial
industry
iron
isolated
machine
machinery
maintenance
manufacture
manufacturing
mechanic
mechanical
mechanism
metal
metallic
motion
motor
movement
object
open
part
plant
power
production
pulley
rotating
rotation
service
speed
spin
spinning
steel
system
technology
transmission
wires
wiring
work
working
workshop