backfinn.后脊(夹层;轧件舌尖;裂缝)
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 fat thickness背膘厚
back-up position背后球篮站立
back-pinched saw夹背锯
back guiding board后导板
back to back L-C背对背信用证
back-extrapolate反向外推
back end processor后端处理机
back to square one问题回到原态
backscatter factor背面散射因数
back-translation回译