英文關鍵字
arc
connect
construction
craftsman
dangerous
drop
electric
electrode
engineering
equipment
fire
firing
flash
glove
green
heating
hot
industrial
light
man
manual
mask
metal
metalwork
motion
person
pipe
plumber
protection
repair
safety
skilled
smoke
sound
spark
sparkle
spatter
squatting
staircase
steel
system
technology
tool
utility
wall
weld
welder
work
worker
workplace