英文關鍵字
adventure
adventurous
afternoon
amazing
caucasian
cave
cavern
ceiling
climbing
dangerous
dark
darkness
deep
directions
disoriented
enter
exit
explore
explorer
extreme
fear
fearless
flashlight
forest
gallery
helmet
hiker
hikers
hole
human
lost
man
mountain
mystery
nature
push
ray
rock
shadow
shine
sightseeing
silhouette
speleologist
speleology
stone
tough
tourism
travel
traveling
tunnel