英文關鍵字
field
rock
dump
mineral
construction
container
mechanical
purification
sewerage
serve
quarry
sedimentation
extraction
operation
application
resource
mechanism
reservoir
tank
accumulation
purity
soil
extract
storage
excavator
equipment
industrial
excavate
earth
sand
tractor
build
dig
ground
loader
truck
activity
power
foundation
engineering
drone