英文關鍵字
blue
bright
busy
carriages
conditions
construction
craftsperson
dark
electrodes
engineering
equipment
eyewear
fabricator
factory
fire
flame
hard
heat
helmet
hot
industrial
industry
iron
light
locomotives
manual
manufacturing
mashinist
mask
mechanical
melt
merge
metal
metalwork
occupation
production
protection
protective
safety
smoke
sparks
steel
structures
tank
torch
train
welder
welding
work
worker