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back-reflection pinhole camera：背面反射针孔照像机

back-reflection focusing came 背面反射聚焦照像机 | back-reflection pinhole camera 背面反射针孔照像机 | back-reflection x-ray exami 背面反射

back pressure multi-effect evaporator：反压多效蒸发器

反压蒸发[法] back pressure evaporation | 反压多效蒸发器 back pressure multi-effect evaporator | 反滴定 back titration

back pressure spring valve：背压弹簧阀

back pressure relief valve 背压安全阀 | back pressure spring valve 背压弹簧阀 | back pressure test 背压试验

Back pressure valve：止回阀,背压阀

back pack pump tank fire extinguisher ||[消]小型背负泵式灭火器 | back pressure valve||止回阀,背压阀 | back scattering||反向(后向)散射

naturally ordered quasi-adequate semigroup：自然序拟适当半群

背靠背:Back-to-Back | 自然序拟适当半群:naturally ordered quasi-adequate semigroup | 回喷:Back-ejecta

back wear：背向磨损

back wave ==> 反射波,反射波 | back wear ==> 背向磨损 | back welding ==> 底焊,退焊法

back geared upright drill press：带齿轮立式钻床

back geared motor 带减速齿轮的电动机 | back geared upright drill press 带齿轮立式钻床 | back grey 印花衬布

back geared upright drill press：背齿轮立式钻床

back-geared ==> 后齿轮的 | back-geared upright drill press ==> 背齿轮立式钻床 | back-hand drainage ==> 倒转水系

back tube plate：后管板

[后]退焊接 back step welding | 后管板 back tube plate | 备用断路器 back-up breaker

back tool rest：后刀架

back to face ==> 反面对反面相叠 | back tool rest ==> 后刀架 | back trace technique ==> 向后追踪技术,回溯技术

chenevixite：砷铁铜石

化学合成作用,化能合成 chemosynthesis | 砷铁铜石 chenevixite | 海沼沙脊 chenier

brown belt：棕色腰带

8.棕色腰带:brown belt | 9.黑色腰带:black belt | 10.红白色腰带:red-white belt