英文關鍵字
and
bulldozer
cab
cable
caterpillar
coal
combine
crane
development
digging
energy
engine
engineer
engineering
enrichment
enterprise
excavator
factory
frost
geodesy
geology
giant
industry
iron
knots
labor
machine
machinery
mechanism
metal
mine
miner
mining
mountains
open
outdoors
parts
production
profession
quarry
rocks
room
rope
size
soil
sorting
stones
technique
tipper
tractor
useful
volume
which
winter
wound