機器
activity
assignment
background
belt
breaker
construction
conveyor
crusher
dig
earth
engineering
equipment
factory
flint conveyor
gravel
high road
highway
industrial
industry
job
labor
landscape
large
line
load
machinery
manufacturing
material
metal
mine
mineral
mountain
occupation
pile
pit
plant
quarry
recycle
road
sand
stone
technology
toil
transportation
way
white
work