英文關鍵字
asia
boulder
brown
coriolis
current
danger
dangerous
down
effect
empty
fish
flow
fluid
foam
force
grunge
july
liquid
looking
mekong
monsoon
motion
mud
natural
nature
outdoors
power
rapids
river
rock
scary
scenic
season
spray
stone
stream
surface
swirl
swirling
texture
trap
tropical
turbulence
turbulent
view
vortex
water
waterfalls
waters
wet
whirl
whirlpool
white