英文關鍵字
activity
base
basis
bedding
bedrock
brick
brigadier
bucket
builders
building
clay
construction
ditch
footing
foundation
fundamental
gravel
gravity
grit
groundwork
job
ladle
load
material
men
multifamily
outdoors
people
pit
sand
steel
substructure
sunny
technology
truck
worker
workers
working
yellow