英文關鍵字
activity
backhoe
chisel
construction
cracked
damage
danger
destruction
dig
digger
dirt
dredger
equipment
excavator
fixing
gravel
hammer
hard
heavy
hole
hydraulic
hydrostatic
industrial
industry
laboring
machine
machinery
male
mechanic
mechanical
occupation
outside
paving
professional
protective
reconstruction
repair
road
safety
service
shovel
site
street
technology
tool
track
trench
work
worker