英文關鍵字
and
bucket
bulldozer
caterpillar
closeup
coal
combine
cubic
development
digging
energy
engineer
engineering
enrichment
enterprise
excavator
factory
frost
geodesy
geology
giant
industry
iron
knots
labor
large
machine
machinery
meters
mine
miner
mining
mountains
open
outdoors
parts
production
profession
quarry
rocks
rope
size
soil
sorting
stones
technique
tipper
tractor
useful
volume
winter