英文關鍵字
activity
behind
black
business
car
coal
crossed
dig
digging
emblem
energy
equipment
fence
hammer
industry
infrastructure
machine
metal
mine
miners
mining
old
people
pick
pickaxe
poland
shift
shovel
sign
silesia
symbol
symbols
technology
tool
tools
tradition
transport
transportation
truck
walking
with
work
worker
working