英文關鍵字
connection
pin
steel
industrial
iron
construction
hinge
metal
anchor
joint
structure
architectural
unscrew
large
bolt
plant
workshop
disassemble
fasten
mechanism
site
tool
checkup
fixation
part
screw
rod
connect
install
hole
assemble
heavy
link
technology
equipment
instrument
vintage
stick
job
mechanic
work
closeup