英文關鍵字
above
aerial
bulldozer
career
coal
construction
copper
deep
diamond
dig
digger
dump
earth
ecology
engineering
environment
equipment
excavate
excavator
extraction
geology
gold
ground
heavy
hill
huge
industrial
industry
iron
loader
machine
machinery
mine
mineral
minerals
mining
open
opencast
pit
quarries
quarry
quarrying
steel
stone
technology
truck
work
workers
world