英文關鍵字
activity
angle
bright
building
cclamp
closeup
construction
dark
electrode
equipment
factory
flash
fusing
glove
ground
heat
high
hot
human
industry
laborer
man
manual
manufacture
manufacturing
mask
melting
metal
motion
occupation
one
person
protection
protective
safety
slow
sparks
speed
steel
super
support
technology
tools
welder
welding
worker
working
workshop
workwear
zap