英文關鍵字
activity
bright
building
business
closeup
connection
construction
craftsperson
electric
electricity
electrode
employment
engineer
engineering
equipment
eyewear
factory
flame
heat
heavy
industry
iron
machinery
manual
manufacturing
mask
melting
men
metal
occupation
one
part
people
person
protective
smoke
sparks
steel
structures
technology
temperature
tool
torch
welder
welding
work
worker
workshop
workwear
yellow