脊背的英文：
back

参考例句：

Of,relating to,or located on the same side of the body as the spinal cord;dorsal.
脊背的属于、相关或位于和脊髓的身体同一边，背部的

When the horse had finished the race, its sides were wet with foam
这匹马结束比赛时，它的脊背被汗水湿透了。

back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后卫
v. 支持；后退，倒退；背书；下赌注于
adj. 背部的；后面的；过去的；拖欠的.
adv. 以前；向后地；来回地；上溯

Stand back to back!
背靠背站好！

They are on the back of the menu.
它们在菜单背面。

Our seats on the train were back to back.
我们在火车上的坐位是背靠背的。

It happened far back in the past.
这事发生在久远的过去。

the back of a Chinese robe or jacket
后襟