the line of bones down the centre of the back that provides support for the body and protects the spinal cord

She injured her spine in a riding accident. 她在一次坠马事故中脊柱受伤。

figurative The Apennine mountains form the spine (= central row of mountains) of Italy. 亚平宁山脉是意大利的中心山脉。

a long, sharp point like a needle growing out of an animal such as a hedgehog or a plant such as a cactus

the narrow strip where the cover of a book is joined to the pages, usually with the title and writer's name printed on it