英文關鍵字
3d
auto
background
closeup
control
cross
current
cut
detail
device
direct
drive
electric
electrical
electricity
energy
engine
engineering
equipment
gear
generator
illustration
induction
industrial
industry
inside
iron
isolated
machine
manufacturing
mechanical
metal
metallic
motor
object
part
power
powerful
repair
rotor
section
shaft
steel
technology
turbine
vehicle
white