短语词组短语back -bone style arch structure tent 脊骨式拱架帐篷Back -bone Class 支架类Long -side back-bone network 长边骨架网Back bone fiber 楼间光缆to the backbone 完完全全；彻头彻尾backbone network 中枢网络，骨干网backbone enterprise 骨干企业 返回 back bone