機器
activity
balance
beam
big
boom
building site
burden
cargo
carry
cement
chain
civil engineering
cloudy
column
concrete
construction
crane
derrick
edifice
elevator
erector
frame
framework
girder
hang
height
high
hoist
hook
hydraulic
industrial
industry
joist
lifter
load
looking up
massive
mobile
moody
part
pillar
site
sky
stormy
tall
telehandler
telescope
telescopic
work