英文關鍵字
amazonia
america
au
benefit
bluff
coinage
deposit
devastating
ductile
ecuador
environment
environments
eroded
extraction
field
flow
gold
hushing
hydraulicking
industry
jet
jewelry
jungle
latin
layer
malleable
metal
mine
minefield
mining
morona
nature
precious
profit
pump
quarry
river
rock
rocks
santiago
south
stone
surface
technology
terrain
value
wash
washing
water