英文關鍵字
assemblage
assemble
assembling
assembly
bolt
closeup
connection
detail
electric
enterprise
equipment
factory
hand
heavy
holding
human
industrial
industry
installation
machine
man
manual
manufacture
manufacturing
master
mechanic
mechanical
mechanician
metal
metallic
metalwork
nozzle
plant
professional
screwdriver
threaded
tighten
tightening
tool
unit
using
work
worker
working
workshop