英文關鍵字
action
arm
bulldozer
cabin
caterpillar
construction
danger
deep
digging
dirt
district
earth
efficiency
energy
excavator
ground
hardwork
heating
heavyduty
heavymachinery
hole
hydraulics
industry
infrastructure
investments
job
machinery
maintenance
metal
mud
operator
operators
outdoors
pile
power
powerful
project
reconstruction
reinforced
repair
rope
spoon
structure
tehnology
trench
underground