英文關鍵字
bright
busy
construction
conveyor
craftsman
danger
electrodes
engineering
equipment
fabricator
factory
gloves
grinding
hangar
heat
helmet
hone
industrial
industry
iron
light
machinist
male
man
manufacturing
mechanical
melt
metal
metalwork
occupation
plant
protection
spark
sparks
steel
welder
welding
worker
workman