英文關鍵字
bright
busy
construction
craftsman
dark
electrodes
engineering
equipment
eyewear
factory
fire
flame
gloves
hard
heat
helmet
hot
industrial
industry
iron
light
machinist
man
manufacturing
mask
mechanical
melt
metal
metalwork
occupation
people
plant
protection
protective
safety
smoke
spark
steel
torch
wear
welder
welding
work
worker
workman