英文關鍵字
mud
pipe
sewage
silt
sand
dirty
dirt
liquid
waste
pump
power
water
construction
flood
machine
drain
closeup
flow
detail
river
toxic
industry
chemical
factory
dump
disaster
influence
nature
septic
cleaning
maintenance
environmental
sludge
sewer
wastewater
sandwash
wash
dredge
amber
sewerage
fluid
drainage
agriculture
well
industrial
flowing
pouring
process
oil
deluge