英文關鍵字
and
bulldozer
caterpillar
combine
crushes
development
digging
energy
engineering
enrichment
enterprise
excavator
factory
frost
giant
heavy
hits
industry
iron
knots
labor
machine
machinery
mine
miner
mining
open
outdoors
parts
production
profession
quarry
rides
road
rocks
rope
size
soil
sorting
stone
stones
technique
tipper
tractor
useful
volume
winter