英文關鍵字
belt
blue
building
business
cement
clouds
commercial
concrete
construction
container
conveyor
crisis
crushed
day
dirt
engineering
environment
equipment
exterior
facility
factory
gallop
gravel
grey
industrial
industry
lorry
macadam
machine
machinery
manufacture
manufacturing
material
metal
mineral
nobody
opencast
pebble
plant
processing
rocas
rock
sand
sandpit
sky
steel
stone
structure
technology
view
work