英文關鍵字
activity
architecture
belt
blue
building
business
cement
cobblestone
concrete
construction
container
conveyor
crisis
dig
engineering
environment
equipment
exterior
extraction
facility
factory
gallop
gravel
grey
heavy
hole
industrial
industry
iron
machine
machinery
manufacturing
material
metal
mountain
panoramic
plant
pouring
process
processing
rock
sand
silo
sky
stack
steel
stone
sunny
technology
view
work