英文關鍵字
and
breakdown
bulldozer
career
careern
caterpillar
coal
combine
development
digging
does
due
energy
engineer
engineering
enrichment
enterprise
excavator
factory
for
frost
geodesy
geology
giant
industry
iron
knots
labor
machine
machinery
mine
miner
mining
mountains
multitone
not
open
outdoors
parts
production
profession
quarry
rocks
rope
size
soil
sorting
stones
technique
tipper
tractor
useful
volume
winter
work
working