英文關鍵字
activity
angle
bright
brilliant
building
cclamp
close
closeup
construction
coveralls
dark
electrode
equipment
factory
fusing
glove
gloves
grinder
hand
heat
helmet
high
human
industry
joining
man
manual
manufacturing
mask
melting
metal
metalwork
motion
occupation
one
person
protective
slow
sparks
speed
steel
strength
support
welder
welding
wire
worker
working
workshop
workwear