英文關鍵字
activity
background
beams
blurred
building
built
bulldozer
cement
city
concrete
construction
crane
development
dirt
drill
earth
engineering
equipment
excavator
gravel
heavy
industrial
industry
machinery
material
men
mode
modern
mover
occupation
people
plant
scoop
site
steel
structure
technology
tower
tractor
transport
vehicle
working