英文關鍵字
blooming
canyon
cave
cavern
cavity
cove
cover
covered
crack
dense
entrance
environment
explore
extreme
foliage
freshwater
gap
geography
green
ground
growing
harsh
helictite
high
hole
hollow
lush
mountain
nature
overgrown
passage
potpec
ragged
rock
rocky
rough
rugged
serbia
soil
speleotherms
steep
stone
stony
stream
thick
tunnel
valley
wild
wilderness