英文關鍵字
shaft
copy
diminishing
perspective
mining
mine
underground
coal
safety
dark
industrial
industry
labor
entrance
stone
tunnel
black
cave
copper
corridor
dig
dirty
engineering
history
mineral
old
tunneling
wall
gold
inside
soot
cavern
lighting
illuminated
mystery
space
dangerous
deep
historical
miner
lamp
way
path
interior
employment
nobody
control
work
subterranean
end