英文關鍵字
adult
arc
barrel
building
business
condition
conditioner
conditioning
connection
connector
construction
cut
cutting
electrician
energy
equipment
fixes
gas
hot
hvac
industrial
industry
install
installation
iron
job
labor
leak
machines
man
manufacture
metal
new
pipe
piping
plumbing
pressing
productionline
professional
protection
repair
repairing
safety
smoke
steel
welding
work
worker