英文關鍵字
accuracy
adjuster
background
closeup
engine
engineering
equipment
factory
foreman
gear
gears
heavy
indoor
industrial
industry
iron
labor
lathe
machine
maintenance
manufactory
mechanic
mechanical
mechanism
metal
metallic
motor
part
power
production
professionals
repair
service
steel
technology
together
tool
transmission
turner
turning
two
work
worker
workshop