英文關鍵字
assemblage
assemble
assembling
bolt
both
clamp
closeup
connection
electric
enterprise
equipment
factory
gun
heavy
holding
industrial
installation
machine
man
manufacturing
master
mechanic
men
metal
metallic
metalwork
nozzle
nut
plant
pneumatic
professional
screwdriver
side
tighten
tightening
tool
unit
using
vehicle
work
worker
workers
working
wrench