英文關鍵字
rock
dump
mechanical
purification
material
tank
quarry
operation
application
resource
containment
container
mechanism
extraction
mineral
reservoir
construction
solution
accumulation
purity
soil
bucket
sieve
work
recycle
operational
utilization
extract
building
worker
storage
industry
equipment
industrial
machinery
earth
sand
dig
ground
activity
foundation
drone