英文關鍵字
aero
bagger
big
bucket
career
construction
destruction
dig
digging
dirt
dragline
dredge
drone
earth
energy
engineering
equipment
excavation
excavator
factory
flight
geology
heavy
industrial
industry
iron
load
machine
machinery
metal
metallurgy
mine
mineral
open
ore
pit
power
quarry
resource
rock
scoop
shovel
sky
soil
steel
stone
technology
transport
trench
work