七層架構

seven layer architecture (OSI)

seven / 7

to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers

to support / frame / rack / framework / classifier for planes, large vehicles, radios etc

to construct; to build / structure; framework; architecture

to construct / to form / to make up / to compose / literary composition / paper mulberry (Broussonetia papyrifera)