英文關鍵字
adult
air
airconditioner
assembly
background
building
business
condition
conditioner
conditioning
connection
connector
construction
cut
drilling
electrician
energy
equipment
fabricate
gas
hot
hvac
industrial
industry
install
installation
iron
join
labor
leak
maintenance
manufacture
manufacturing
metal
new
person
pipe
plumber
plumbing
productionline
repair
safety
shiny
smoke
system
technical
technician
welding
work
worker