英文關鍵字
cash
coal
construction
copper
dig
digger
discover
discovery
engineering
excavate
finance
gold
golden
goldmine
hunt
industrial
industry
iron
jewelry
liquid
machine
metal
mine
miner
mineral
minerals
money
mound
nugget
old
ore
outside
plant
pool
precious
processing
rich
rock
rush
sell
shiny
silver
stone
tank
texture
treasure
vehicle
water
work
yellow