backman辅助工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 to Back Ionization Chamber背对背电离室back-Compton scattering laser逆康普顿散射激光器back-scatter electron imaging反散射式电子显像Backorder Problem Working Group缺件待发货单问题处理小组back and leg muscle dynamometer背及腿部肌力计back - pressure steam turbine背压式汽轮机back-to-the-wall election背水一战的选举; 难以获胜的危险选举back-scattered radiation dose反向散射辐射剂量back propagating neural network反向传播神经网络back-type life support system背包生命保护系统