英文關鍵字
brass
business
cable
closeup
coil
connection
construction
copper
drawing
electric
electricity
energy
engineering
equipment
factory
hardware
heavy
indoors
industrial
industry
iron
large
line
machine
macro
manufacture
manufacturing
material
metal
movement
obsolete
plant
power
process
processing
production
pull
reel
shiny
spool
supply
technology
tool
wire
work