英文關鍵字
activity
background
balance
beton
block
building
cable
cargo
carrying
cat
conceptual
concrete
construction
contraction
crane
element
equipment
fragment
freight
heavy
hoisting
hook
industry
isolated
lading
lift
lifting
load
machine
machinery
market
mechanism
metal
picking
plate
pulley
rail
roof
rope
shipment
sight
site
slab
steel
symbol
tin
weight
white
winch
yellow