英文關鍵字
1080
alternative
cascade
clean
construction
dam
daugava
day
ecology
electric
electricity
energy
engine
environment
fall
flood
floodgate
flow
gate
generating
generation
generator
green
hydro
hydroelectric
hydroelectricity
industrial
industry
latvia
motion
nature
outdoors
plant
pouring
power
renewable
reservoir
riga
river
running
spillway
station
stream
structure
technical
turbine
water
waterfall