機器
accuracy
action
arc
automated
automobile
automotive
background
bright
brightly
color
construction
cutting
danger
descriptive
engineering
equipment
factory
fire
heat
industrial
industry
iron
laser
light
manual
manufacturing
material
metal
metalwork
nut
occupation
part
portion
power
repairing
safety
sheet
shop
skill
sparks
spot
steel
technology
tool
welder
welding
work
worker
workshop