英文關鍵字
autumn
beach
cascade
cellar
cling
coast
cold
construction
contractor
current
danger
devon
dirt
dirty
downstream
drain
drainage
duct
eddy
fall
fast
floods
flora
foliage
heavy
heddon
hike
hole
industrial
industry
jettison
liquid
machine
maintenance
manhole
mouth
muddy
national
north
open
outdoor
outside
peril
pump
rainfall
rains
rainwater
rapids
replacement
river
rock
rush
rushing
see
sewer
sewerage
splash
spray
stone
stream
street
stroll
sun
sweep
swept
swim
trek
trust
underground
upstream
urban
valley
valve
vegetation
walk
wash
water
wet
white