英文關鍵字
adult
aluminum
assembling
buildings
closeup
construction
equipment
factory
footage
gun
hand
horizontal
human
indoors
industry
installing
iron
line
machine
machinery
males
manual
manufacturing
men
metal
metalwork
occupation
people
preparation
production
pvc
real
repairing
repairman
resistance
romania
screw
skill
steel
structure
technology
time
tool
toughness
work
worker
working
workshop