英文關鍵字
arc
background
bright
busy
chrome
closeup
construction
conveyor
danger
electric
electricity
electrode
electrodes
electroplating
environment
equipment
factory
fire
flame
hard
heat
high
illuminated
industrial
industry
iron
isolated
liquid
machine
manufacturing
mask
material
metal
plant
process
production
rod
safety
science
steel
technology
tool
weld
welder
welding
white
wire
work
worker