英文關鍵字
action
arc
connect
construction
craftsman
dangerous
dark
electric
electrode
engineering
equipment
fire
firing
flash
glove
heating
hot
indoor
industrial
industry
iron
job
lot
making
man
manual
manufacture
manufacturing
metal
metalwork
motion
move
person
pipe
repair
room
safety
site
skill
skilled
smoke
sound
spark
sparkle
steel
system
weld
welder
work
workplace