英文關鍵字
abstract
background
barrage
bubbles
canal
cascade
cascading
dam
droplets
drops
environment
fall
flow
flowing
fluid
height
hertfordshire
irrigation
landscape
lee
level
liquid
management
motion
movement
natural
nature
outdoor
pattern
pouring
regulate
river
rural
scenic
small
spillway
splash
stort
stream
surface
water
waterfall
wave
weir
weirs
wild