英文關鍵字
architecture
arid
backhoe
bricklayer
building
bulldozer
cement
concrete
construct
construction
container
conveyor
crane
dozer
earth
execution
extraction
factory
gravel
industrial
industry
labor
machine
mason
masonry
material
mixture
pebble
pebbles
pile
quarry
river
sand
shot
steam
steel
stone
stones
track
truck
unloading
vehicle
wheel
work
worker