backguyn.拉索；拉条；支撑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 surface field背面电场backfilling stroke背面上浆刮程Back Order Release根据缺件待发货单而发出的货物back-to-nature回归自然的back bolt modality背栓式back goods freight退货费用back pain syndrome背痛综合征Back to back probe靠背式探头back magnetization反磁化Backus normal form巴科斯范式