英文關鍵字
boulder
breakage
cave
chamber
coarse
cranny
crevices
crooked
debris
dig
dirt
edges
excavate
formation
gaps
heap
illumination
interior
lights
limestone
lit
mound
natural
niche
pile
quarry
rocks
rough
rubble
ruins
sands
sedimentary
shadow
stone
surface
texture
tunnel
underground
underpass