“背脊”的英语？

背脊生来就是负重的.The back is shaped to the load.那男孩用石子掷击小流氓的背脊.The boy gave the bully a pelt on the back with a pebble.敢情是钓索在它高高隆起的背脊上滑动了一下.The wire must have slipped on the hill of his back....

“背脊”的拼音为：bèi jí...