英文關鍵字
appliances
background
brass
business
cable
color
component
conveyor
copper
electrical
electrician
electricity
electromagnetism
energy
engineering
equipment
factory
hardware
heavy
machine
machinery
manufacturing
metal
metallic
orange
plant
power
process
production
reactive
roll
spiral
spool
steel
supply
thin
thread
tool
transformer
voltage
wire
wiring
work
workshop