英文關鍵字
appliance
arc
argon
close
construction
craftsman
cutting
dangerous
door
electric
energy
engineering
equipment
fabrication
factory
fire
flash
flies
gas
gauge
hand
hot
industrial
industry
job
labor
light
machine
man
manufacture
manufacturing
mask
metal
pressure
production
protection
repair
safety
skilled
smoke
spark
steel
structure
technical
technology
tool
weld
welder
welding
work
worker