英文關鍵字
area
bottom
bucket
builders
building
civilengineering
clay
composition
concrete
construction
development
digger
element
excavator
formwork
foundation
gravel
hat
land
large
load
loading
loam
material
men
mud
pebble
people
pit
poured
quarry
reinforcement
shovel
site
soil
stone
strength
summer
technology
timbering
uploading
worker
workers
working
yellow