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back-raking：后清除(由动物直肠內挤压出的粪便)

back-flow 回流;逆流 | back-packing cure 肉的包裹腌制法 | back-raking 后清除(由动物直肠內挤压出的粪便)

back-scratcher：背挠

back-scatteringthicknessgage 反向散射厚度计 | back-scratcher 背挠 | back-seatedvalve 后座阀 强迫就位阀

back-set bed：逆流层

back-selling ==> 逆向销售 | back-set bed ==> 逆流层 | back-setting effect ==> 逆流效应

back-spiker：钉道工

back rule 背缘尺 | back-spiker 钉道工 | back veneer 背[板]单板

back bridge wall：挡烟桥,火桥

back bridge relay ==> 反桥接继电器=>被呼者継電器 | back bridge wall ==> 挡烟桥,火桥 | back bulb ==> 背生鳞茎,衰老球根

back up chain tongs：咬定链钳

back twisting 反向加捻 | back up chain tongs 咬定链钳 | back up information 后备信息

back clearance angle：车刀纵向后角

back clearance || 背隙(螺纹) | back clearance angle || 车刀纵向后角 | back clipping on || 后向剪裁打开

back bone,vertebral column,spine：脊椎骨

\\"背部\\",\\"back\\" | \\"脊椎骨\\",\\"back bone,vertebral column,spine\\" | \\"回交\\",\\"back cross\\"

back flap hinge：明铰链

back firing detective relay 逆弧检测继电器 | back flap hinge 明铰链 | back gear shaft 背齿轮轴

back ground current：维弧电流

back ground ==> (即底影)背景 | back ground current ==> 维弧电流 | back guide ==> 后导板

colonial rule：殖民统治

colonial protectorate;殖民保护地;殖民被保护国;; | colonial rule;殖民统治;; | Colonial Secretary;辅政司;;

matrimonial agency：婚姻介绍所

21 deep love 深沉的爱情 | 22 matrimonial agency 婚姻介绍所 | 23 lover,sweetheart 情人