英文關鍵字
arc
circle
closeup
construction
craftsman
cut
cutting
electric
electrode
engine
engineering
factory
fire
flash
industrial
industry
iron
labor
laborer
light
machine
manufacture
manufacturing
mask
mechanic
metal
metalworking
motor
off
old
part
pipe
power
protection
repair
safety
scale
seam
skill
soot
spark
spray
steel
technology
tool
transportation
using
vehicle
vice
welder
welding
welds
work
worker
workshop