Backo巴茨科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 rind开模缩裂backliner书脊粘衬机back vane背叶片back dive向后跳水backshift准备班,交叉班backcourt距门最远处Backemalm巴克马尔姆back haul返航载运,后曳backbeachn.后滨back rent欠租

1. Someone burped loudly at the back of the hall.
   某人在大厅后部大声打嗝。
2. The operation cannot be performed on a back link.
   操作不能在一个后部链接上执行。
3. The back of this snake is mottled.
   这条蛇的背部有杂色斑点。
4. Gently pat his back until he burps.
   慢慢地拍他的背部直到他打嗝为止。