英文關鍵字
adventure
alleviation
anastomus
asian
attraction
cave
caver
cavern
coalmine
colliery
corridor
crossing
daylight
earth
end
expedition
exploration
flashlight
game
geo
geology
gold
grotto
hole
industrial
industry
labyrinth
land
lankanl
lawn
lawnihz
light
nature
openbill
oscitans
output
passage
pit
relief
relieved
relievedn
resting
rock
scary
sleeve
speleological
speleology
sri
stork
subsurface
subway
terra
torch
tourism
travel
treasure
tunneasian
tunnel
turning
underground
underworld
wormholen