英文關鍵字
2020
boat
bottom
canal
clean
cleaning
clearing
construction
crane
deepening
digging
dirt
dirty
dredge
dredger
dredging
ecological
ecology
engineering
environment
environmental
equipment
excavation
excavator
excavators
floating
garbage
industrial
industry
july
lake
landscape
machine
machinery
management
mud
nature
other
outdoors
platform
pollution
pond
purification
recycling
reservoir
river
riverbeds
rivers
sediment
serbia
sewage
ship
sludge
special
treatment
urban
use
waste
water
waterway
work
working
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