Backusn.巴克斯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 extractn.反萃取back to home回到本垒backing film底片backing roll承压滚筒,支承辊back againstadj.背朝(背紧靠着)back up tape后备带backing weld底焊焊缝,底焊backing copy[计] 备用拷贝back blading倒车叶片back washing回洗,复洗