environmental
aerial
agricultural
agricultural canal
agriculture
biology
canal
clear
concrete
construction
continent
countryside
courtyard pond
dirty
dirty water
ecology
environment
environmental pollution
ewage
factory
farmland
field
filtration
flow
flowing
garden
geography
global
harvest
industry
irrigation
natural
pipe
plant
pollution
production
purification
recycling
reflection
reservoir
river
sludge
technology
treatment
waste
wastewater
water
water purification
watercontrol
waterfall
定額
Yellow-green wastewater flows along the city walls. waterfall sewage, sewage, environmental problems and clean drinking waterの素材 [FY310153176355]
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