英文關鍵字
activity
arc
bench
blue
bright
building
cclamp
closeup
construction
dark
electrode
engineering
equipment
factory
grinder
haze
heat
high
human
industry
man
manual
manufacture
manufacturing
mask
metal
motion
occupation
one
person
plate
protection
protective
slow
smoke
sparks
speed
steel
stick
strength
super
technology
welder
welding
wheel
wire
worker
working
workshop
workwear