英文關鍵字
activity
asphalt
bagger
black
building
car
city
construction
day
equipment
excavator
highway
hot
industrial
industry
lines
machine
machinery
manual
men
occupation
orange
paving
people
protective
railroad
rails
repairing
road
shovels
site
steam
steamroller
street
summer
team
tram
tramway
transportation
uniform
warm
worker
workers
working