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