英文關鍵字
action
active
activity
adult
building
clay
construction
deepening
dig
digger
dirty
ditch
drainage
dry
earth
economy
efficiency
fatiguing
foot
ground
hard
heavy
hole
improvement
irrigation
job
line
nature
outdoor
person
pipe
pipeline
power
professional
road
rural
sand
shoes
shovel
site
soil
spade
supply
tool
trench
utilities
water
work
worker
workman