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back-lighted shot：逆光摄影

"透光雕绘","back-light scribing" | "逆光摄影","back-lighted shot" | "后向散射","back-scattering"

back-lighted plotting surface：反光绘图面

back-level release ==> 后层释放 | back-lighted plotting surface ==> 反光绘图面 | back-migration ==> 反向移动

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\\"

dioptric：折射光学的

dioptre 屈光度 | dioptric 折射光学的 | dioptrics 折射光学

Saturdays are fun：星期六很有趣

6. Saturdays are fun.星期六很有趣. | fun 为不可数名词,"快乐,有趣",在此做表语. | That must be fun. 那一定很有趣.