英文關鍵字
welding
angle
steel
saw
worker
circular
metal
machine
light
construction
cutoff
spark
abrasive
flash
grinding
industrial
grinder
safety
work
factory
industry
power
welder
workwear
job
timelapse
equipment
cutter
engineering
hot
metalwork
metallurgical
welded
carving
making
repair
protective
rusty
metallurgy
labor
man
polishing
fire
production
glandular
lapse
cutting
shipyard
manufacturing