the part of a network that connects other networks together; "the backbone is the part of a communication network that carries the heaviest traffic"
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; "the title and author were printed on the spine of the book" 同义词:spine,
fortitude and determination; "he didn''t have the guts to try it" 同义词:grit, guts, moxie, sand, gumption,
a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm" 同义词:anchor, mainstay, keystone, linchpin, lynchpin,