英文關鍵字
background
brook
cascade
cascading
clean
countryside
dam
detail
drop
electricity
energy
environment
fall
falls
flow
flowing
foam
force
fresh
high
hydro
irrigation
keen
motion
nature
open
outdoor
overflow
plant
pond
pool
pouring
river
run
scenery
scenic
slope
small
space
spillway
splash
store
stream
wasteland
water
waterfall
weir
wilderness