英文關鍵字
agricultural
agriculture
auger
bore
borehole
boring
clay
construction
deep
development
digger
dirt
drill
drilling
earth
earthwork
engineering
equipment
excavate
exploration
foundation
geodesy
geological
geologist
geology
ground
heavy
high
hole
hydraulic
industrial
industry
job
machine
machinery
measurement
measuring
mining
outdoor
rig
site
soil
steel
structure
technician
testing
tool
work
worker