英文關鍵字
attraction
banana
beam
bedding
cave
cavity
devils
doline
dust
fall
feature
flood
freak
funnel
geographical
geography
glow
goes
ground
gully
hole
karst
landmark
lanka
light
lighting
miracle
mountain
natural
nature
penetrates
phenomenon
ponor
pothole
powerful
ray
river
scour
sink
sinkhole
sluggy
sri
stream
subterrarian
sunlight
sunshine
swallow
type
underground
wash
washaway
washboard
water
waterfall
wonder