英文關鍵字
basin
canal
dirty
downpour
drain
drainage
drop
engineering
environment
fall
falls
flash
flood
flow
free
grate
hole
industrial
metal
motion
nature
open
rain
raindrop
rainfall
rainstorm
rainy
raw
reservoir
river
road
scatters
sewage
sewer
sewerage
sides
slow
spillway
splash
splashing
spray
steel
stilling
stone
stream
structure
supply
technology
turbulent
wada
wall
water
weir
wet