英文關鍵字
concrete
building
material
line
symbol
production
road
equipment
foundation
cement
bag
spatula
tool
bridge
airport
runway
linear
symbols
mixer
structure
reinforcement
paving
slabs
floor
beams
walls
panel
house
dam
facility
pipes
fence
breakwater
truck
transportation
icon
motion
graphic
animation
pictogram
hd
animated
item
sign
black