英文關鍵字
arc
bright
busy
construction
craftsman
dangerous
engineering
equipment
factory
fire
gas
gloves
grinder
heat
helmet
industrial
industry
iron
laborer
light
making
man
manufacture
manufacturing
metal
metalwork
occupation
person
production
protection
repair
safety
skill
smoke
spark
steel
structure
technology
tool
torch
welder
welding
work
worker
workman
workplace