英文關鍵字
arc
connect
construction
craftsman
dangerous
des
drop
electric
electrode
fire
flash
glove
hot
housing
industrial
industry
light
man
manual
mask
metal
metalwork
motion
office
pipe
plumber
protection
public
repair
safety
sanitary
skill
skilled
smoke
spark
sparkle
spatter
squatting
staircase
steel
structure
technology
tool
utilities
utility
weld
welder
wide
wideangle
worker