英文關鍵字
activity
architecture
arm
boom
building
built
cable
cargo
cloud
cloudscape
cloudy
construction
contemporary
crane
day
derrick
engineering
equipment
heavy
hoisting
housing
industrial
industry
iron
jib
line
load
loading
machine
machinery
metal
motion
move
moving
nobody
operating
overcast
picking
rope
scaffolding
scene
site
sky
skyscraper
steel
structure
tall
technology
tower
work
working