英文關鍵字
alloy
building
bundle
closeup
conditions
connection
construction
dangerous
dark
development
dirty
electric
electricity
electrode
electrodes
energy
equipment
extreme
factory
fumes
group
hard
heavy
indoors
industrial
industry
insulation
iron
job
light
low
manufacture
manufacturing
metal
metallurgy
nobody
objects
peg
poisonous
preparing
product
production
protector
rod
scene
shot
smoke
steel
supply