英文關鍵字
alloy
argon
auto
boiler
car
copper
craftsman
equipment
fire
fixing
garage
gas
gauge
heat
industry
ingot
instrument
iron
joint
lead
local
man
manual
metal
metallic
part
people
person
radiator
repair
safety
service
shop
smoke
solder
soldering
spark
steel
technician
technology
tin
tool
weld
welder
welding
work
worker
workplace
workshop