- a central cohesive source of support and stability
同义词：anchor, mainstay, keystone, backbone, linchpin, lynchpin
- fortitude and determination
同义词：backbone, grit, guts, moxie, sand, gumption
- the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
同义词：spinal column, vertebral column, spine, backbone, back, rachis
- the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
同义词：spine, backbone
- the part of a network that connects other networks together
同义词：backbone
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