英文關鍵字
background
bobbin
brass
bronze
business
cable
circle
coil
conveyor
copper
electric
electricity
energy
engineering
equipment
factory
hardware
heavy
industry
machine
machines
manufacturing
metal
metallic
metalworking
motor
orange
parts
plant
power
production
reel
roll
roller
rolling
spool
steel
supply
tool
transformer
turning
winding
wire
work
workshop