spine

noun [具体名词]脊髓，脊柱；书脊；（动植物的）刺，刺毛；中心力量，中流砥柱；骨气，勇气；直线型薪酬级别制；（地质）火山栓，熔岩塔

The spine of a book is the narrow stiff part which the pages and covers are attached to. (
书) 脊 •  ...a book with "Lifestyle" on the spine.  …一本脊上印有“生活方式”的书。