英文關鍵字
age
anatomy
ancient
archaeological
archaeologist
archeology
cave
culture
excavation
flame
grave
historical
history
human
hunting
interview
journey
lake
male
man
neanderthal
old
paleolithic
people
prehistoric
prehistory
primitive
research
river
rocks
ruins
savage
speleologist
speleology
stone
student
studying
take
tomb
torch
travel
underground
wall
water