back-contact layer [物理學]背接觸層back-cone n.錐形齒輪的輔助錐back-coming n.后退式回采back-check n. （已完成工作之）檢查 vt. 查驗back-channeling 渠道返回back-carrying reduction [醫(yī)藥科學]人背復位back-call 第二次訪問back-calculation modulus [交通運輸工程]反算模量back-calculation 反算back-busting 辛苦的back-burner adj.一時非優(yōu)先的；暫處次要地位的v.把back-burn 逆風用火back-bulb 衰老球根back-breaking (adj.) back-breaking adj.腰酸背痛的；腰酸背痛的工作指很多重體力勞動back-boundary cell 后膜光電管back-bone style arch structure tent [經(jīng)濟學]脊骨式拱架帳篷back-bone network 中框網(wǎng)back-bone n.脊骨脊柱back-bombardment 反轟擊