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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

tool back plane：切深剖面

tool back clearance ==> 刀具纵向后角 | tool back plane ==> 切深剖面 | tool back rake ==> 刀具纵向前角

back taper tap：倒锥丝锥,机用丝锥

back taper ==> 倒锥 | back taper tap ==> 倒锥丝锥,机用丝锥 | back tax ==> 退缴税

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.