英文關鍵字
arc
built
connection
construct
construction
engineering
equipment
factory
flame
gas
goggles
heat
industrial
industry
iron
job
light
man
manual
manufacturing
mask
metal
metallurgy
metalwork
natural
occupation
part
pipeline
plumbing
power
production
protection
protective
steam
steel
tool
torch
tubing
tungsten
valve
water
weld
welder
welding
work
worker
workplace
workshop
workwear