Backen.巴克backn.后面；背脊；靠背；后背；后卫vt.支持；后退adv.向后地adj.向后的；后面的；偏远的；过时的；积欠的back rule反向规则back jamb侧樘back sidt背面住宅基础back pads小靠垫back hole顶板炮眼back lath顶板背板back lash啮合间隙,侧隙back doorn.后门；非法途径backshank针尾backtrackv.由原路返回；走回头路

1. The power station backs on to a high mountain.
   发电站背靠着大山。
2. He leaned his back against the wall.
   他把背靠在墙上。