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backendn.后端adj.后端的Backens巴肯斯backdownn.弃权；让步back arc[电] 回弧backview背立面backcastn.臆测描写; 重新构想出backbitev.背后诽谤；背后中伤back run底焊焊缝,反转backwind使风转向back hub后视标杆