英文關鍵字
bearings
business
color
commercial
concepts
controls
detail
engineering
equipment
factory
gear
indoors
industrial
industry
ink
job
machine
machines
manufacturing
mechanic
media
metal
metallic
motion
movement
moving
newspaper
nobody
object
office
offset
paper
part
plant
press
printer
printing
publish
rolled
roller
single
store
tools
traditional
wheels
work
workshop