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Back pressure valve：回压阀

back-pressure regulator 回压调节器 | back-pressure valve 回压阀 | back-purge system 反冲洗系统

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

back projection：反射影

back pressure 反压 | back projection 反射影 | back rest 靠背架

back projection operation：反投射运算

back print method 反面印刷法 | back projection operation 反投射运算 | back prop 后撑,后支柱

back rent：欠租

back pay 欠付工资 | back rent 欠租 | back spread 逆差价,缩差

back rent：欠租, 过期未付的房租

back release | 快门按钮 | back rent | 欠租, 过期未付的房租 | back resistance meter | 反向电阻测量计

back room：密室

back room boy 秘密工作人员 | back room 密室 | back slang 倒读隐语

back room：密室, 里屋

back roll | 重算, 重新运行, 反绕 后滚筒 | back room | 密室, 里屋 | back rooms | 商店的辅助库房

back room boy：秘密工作人员

back pay 欠薪 | back room boy 秘密工作人员 | back room 密室

put/get sb's back up"=make sb angry：触怒某人,使之生气

He put his back into studying for the exam. 他为考试尽全力学习. | 6."put/get sb's back up"=make sb angry 触怒某人,使之生气 | What he did at the party put her back up. 他在舞会上的所做所为惹恼了她....

phenol red：酚红,苯酚磺酞

phenol reagent 酚试剂 | phenol red 酚红,苯酚磺酞 | phenol red test 酚红排泌试验

accessory equipment：附件

accessory equipment 辅助设备 | accessory equipment 附件 | accessory part 附件